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  • Articles  (29)
  • Spektralphotometrie, Atomabsorption  (17)
  • Adult
  • Triticum aestivum
  • Springer  (29)
  • American Association for the Advancement of Science (AAAS)
  • 1990-1994
  • 1980-1984
  • 1975-1979  (29)
  • 1977  (29)
Collection
  • Articles  (29)
Source
Keywords
Publisher
  • Springer  (29)
  • American Association for the Advancement of Science (AAAS)
Years
  • 1990-1994
  • 1980-1984
  • 1975-1979  (29)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Glutamate oxaloacetate transaminase isozymes of the Triticinae: dissociation and recombination of subunits (1977)
    Springer
    Theoretical and applied genetics 50 (1977), S. 47-51 
    Details
    ISSN: 1432-2242
    Keywords: Glutamate Oxaloacetate Transaminase ; Isozymes ; Triticum aestivum ; Subunits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A simple procedure has been developed for the dissociation of active molecules of glutamate oxaloacetate transaminase (GOT: E.C. 2.6.1.1) into protomers and for the reassociation of the subunits into active enzymes. Results of experiments in which the protomers of genetically controlled electrophoretic variants of GOT of Triticum aestivum and of several related species were dissociated and recombined in crude tissue extracts and in partially purified preparations support the hypothesis that the enzyme exists functionally as a dimer in the Triticinae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00273797
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  • 2
    Electronic Resource
    Electronic Resource
    Protein accumulation, RNA and soluble amino nitrogen content in developing endosperm of two varieties of Triticum aestivum with high and low protein seed (1977)
    Springer
    Theoretical and applied genetics 50 (1977), S. 73-77 
    Details
    ISSN: 1432-2242
    Keywords: Triticum aestivum ; Wheat ; Endosperm ; Protein Synthesis ; RNA Level ; Amino Acid Translocation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The kinetics of protein accumulation, the variation in RNA, the soluble amino nitrogen content of developing endosperm of two varieties of Triticum aestivum, with high and low protein content in the mature seed, suggest a possible relation between maintenance of the RNA content and the ability to synthesize protein. A sudden halt in protein accumulation is observed as the RNA starts to decrease. The hypothesis is also advanced that maintenance of the RNA content might, in turn, be dependent on the presence, in the endosperm of developing wheat seed, of a certain level of soluble amino nitrogen which could then play the role of limiting factor for protein synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00277249
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  • 3
    Electronic Resource
    Electronic Resource
    The association of genes for purple coleoptile with chromosomes of the wheat variety Mironovskaya 808 (1977)
    Springer
    Euphytica 26 (1977), S. 475-479 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; anthocyanins ; centromere ; chromosome mapping ; crossover units ; dominant genes ; monosomics ; partially dominant ; purple coleoptile ; suppressors ; telocentric chromosome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The association of genes for purple pigment in the coleoptile with the chromosomes of the winter wheat variety Mironovskaya 808 was investigated using monosomic F2 analysis. The segregation ratio for F2 hybrids of Chinese Spring monosomics x Mironovskya 808 seems to indicate that the purple colour of the coleoptile is determined by two dominant genes, Rc3 and Rc4, which are located on the chromosomes 7D and 6B respectively, and which reinforce each other. Apart from these two genes, suppressors found on the chromosomes 2A, 2B, 2D, 4B and 6A also play a role in the intensity of the purple colour. With the aid of a Chinese Spring telocentric chromosome marker it was observed that the Rc3 gene is located on the chromosome arm 7DS, at a distance of 16±4.23 crossover units from the centromere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027010
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  • 4
    Electronic Resource
    Electronic Resource
    Flag leaf area in five spring wheat crosses and the relationship to grain yield (1977)
    Springer
    Euphytica 26 (1977), S. 739-744 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; flag leaf area ; grain yield
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Five spring wheat crosses were evaluated over a 6-year period using comparisons between F2 and F3 data and between near-isogenic F4 populations selected for flag leaf area. Nonsignificant r values for F2 vs. F3 flag leaf measurements may be due to the effect of environment on flag leaf area, but are probably also an indication of low heritability for this plant character. Near-isogenic populations selected on the basis of flag leaf area showed little difference in grain yield, an indication that other plant parts must be more influential in determining grain yield. Flag leaf area, by itself, appears not to be a good index to plant performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021700
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  • 5
    Electronic Resource
    Electronic Resource
    Utilization of tom thumb source of pre-harvest sprouting tolerance in a wheat breeding programme (1977)
    Springer
    Euphytica 26 (1977), S. 565-572 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; pre-harvest sprouting ; Tom Thumb derivatives ; GA3 response index ; apparent α-amylase synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Segŕegating populations of the cross Tordo (a spring white-grained Tom Thumb derivative) and Tr 454-16 (a spring white-grained Sonora-Gabo derivative) were studied for plant height, apparent α-amylase synthesis (AAS) and response to gibberellic acid. Means, variances and heritabilities for these characters were computed and their association was studied by computing correlation coefficients. Plant height showed high heritability while AAS and response to GA3 showed moderate heritability. Plant height was positively correlated with AAS and response to GA3. The results pointed out the importance of using Tom Thumb as a source of pre-harvest sprouting tolerance in a wheat breeding programme, particularly in areas where wheat breeding is restricted to evolving white-grained cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021682
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic and environmental variability in wheat characteristics reported to be involved in morphological resistance to wheat stem rust (1977)
    Springer
    Euphytica 26 (1977), S. 123-128 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; stem rust ; Puccinia graminis tritici ; generalized resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Four morphological characteristics of wheat peduncles were evaluated for genetic and environmental variability. The thickness of the epidermis and the amount and distribution of chlorenchyma tissue in the peduncle were measured. The genetic variability was estimated to be large, whereas the environmental variability was small. It was also concluded that cultivars could be screened for morphological characteristics of the peduncle that contributed to non-specific resistance to stem rust with a minimum sample size of about 10 plants per replication from a single location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032077
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  • 7
    Electronic Resource
    Electronic Resource
    Adaptation of semidwarf wheat cultivars to rainfed conditions (1977)
    Springer
    Euphytica 26 (1977), S. 129-139 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; grain yield ; tall plant ; semidwarf plant ; adaptation ; dryland ; regression analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary With a view to determining the comparative adaptation of semidwarf wheats to rainfed conditions, adaptation analyses were carried out on grain yield data of the 6th and 7th International Spring Wheat Yield Nurseries of the International Maize and Wheat Improvement Centre. Sites were chosen which had not received irrigation: across a combined total of 44 such sites, yield variation was closely related to growing seasonal rainfall. Using these sites, yields of thirty-three common cultivars. Norin 10-derived semidwarf cultivars plus tall ones, were regressed against site mean yield to give a regression slope (b) and deviations from the regression (sd 2) for each cultivar. Semidwarf cultivars generally showed higher mean yields and larger regression slopes (b 〉 0.9) than tall cultivars from lower latitudes. Tall cultivars from higher latitudes showed the lowest mean yields and the lowest b values (〈 0.7). No consistent trends in sd 2 were evident. Despite the greater regression slopes of semidwarf wheats, the best yields under all but the lowest yielding (driest) conditions were given by certain semidwarf cultivars; these had high mean yields and b values close to 1.0 (for example Tobari 66, Inia 66, Pato ArGentino and Sonalika). In contrast other semiwdarfs (notably Chenab 70) of similar mean yield, plant height and phenology, were not well adapted to the drier conditions as indicated by b values close to 1.3. The usefulness of the regression technique and the implications of these results for selection of semidwarf wheats adapted to drier conditions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032078
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  • 8
    Electronic Resource
    Electronic Resource
    On the problem of pre-harvest sprouting of wheat (1977)
    Springer
    Euphytica 26 (1977), S. 299-308 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; pre-harvest sprouting ; components of resistance to sprouting ; complex resistance (RCP) ; α-amylase synthesis ; GA3 response ; wheat endosperm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The problem of pre-harvest sprouting in wheat is very intricate. New concepts in breeding for resistance to pre-harvest sprouting regard many components such as α-amylase production potential, response to gibberellic acid and inhibition in the bracts as important as dormancy. In the research work carried out at The University of Sydney's Plant Breeding Institute, we found varietal differences for each of these components. We also developed criteria for screening breeding material for these components. The implications of our findings in planning efficient breeding programmes to evolve varieties with multiple resistance to pre-harvest sprouting have been discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026991
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of three sources of pollen fertility restoration genes and natural outcrossing of cytoplasmic male-sterile wheat (1977)
    Springer
    Euphytica 26 (1977), S. 681-695 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; bread wheat ; Triticum timopheevi ; fertility restoration ; cytoplasmic male sterile ; percent fertility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fertility restoration genes in Triticum aestivum L. in Texas Restorer Composite (TRC), D6301, and four CIMMYT restorer lines were studied, and selection was made for higher fertility in TRC. Mean-while, outcrossing percentages of seed set for 27 spring habit cytoplasmic male sterile (cms) varieties were evaluated for 3 to 5 years at Davis. The winter-habit TRC material did not restore reasonably good fertility, and the response to selection for higher fertility seemed to be slow. This poor fertility could be partly due to its late winter growth habit causing flowering at a period of high temperature and low humidity at Davis. The highest F1 fertility was 46.6% in the cross cms Ramona x TRC-6, and its F2 segregated into the ratio of 15 fertile to 1 sterile, with fertility ranging from 3.2 to 100%. Suggested for its improvement was intensive selection in the original TRC material and in the segre-gating F2 population, followed by intercrossing. D6301 has 2 fertility restoration genes with different strengths which restore fertility up to 45.2% when both genes are heterozygous. D6301 is quite likely heterogeneous for these genes. Four CIMMYT restorer lines, D7464, D7465, D7466, and D7467, had satisfactory F1 fertility restoration after crossing with cms Ramona 50. In 1975, the fertilities of the F1's ranged from 71 to 85% and were over 90% in 1976. The F2 population of the cross cms Ramona 50 × D7464 segregated into a ratio of 3 fertile to 1 sterile, indicating that D7464 has a single dominant gene for fertility restoration. The F2's of crosses cms Ramona 50 × D7465, cms Ramona 50 × D7466, and cms Ramona 50 × D7467 gave a ratio of 15 fertile to 1 sterile, indicating that two gene pairs in these three lines were responsible for the fertility restoration. The best of this group was D7467 which restored fertility fully after being crossed with cms Ramona 50 (T. timopheevi cytoplasm). The early-flowering cms male-sterile varieties had higher outcrossing rates (16 to 38%) than late varieties (6 to 30%) over a 5-year period. This was due to hot and dry weather during the late growing season as well as to the rarity of windborne pollen. In 1970, 1971, 1972, and 1976, the variation among varieties was rather great. Some of them such as Roque 66 and Bajio 67, had consistently high outcrossing rates. This outcrossing ability seemed to be inherited and probably associated with the open-flowering characteristics of each variety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021693
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  • 10
    Electronic Resource
    Electronic Resource
    Breeding for resistance to cereal cyst nematode in wheat II. Use of test tube cultures in selection (1977)
    Springer
    Euphytica 26 (1977), S. 89-95 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Heterodera avenae ; cyst nematode ; resistance breeding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The use of soil. naturally infested with Heterodera avenae, to select resistant heterozygotes in backcross progenies of wheat, was tested for reliability. Selfed progenies from plants selected as resistant were cultured monoxenically in test tubes with nematodes hatched from single cysts, while backcross progenies from the same parent plants were grown in pots of naturally infested soil. Cyst counts were made after two months' growth. The results showed that over 50% of the backcross lines, screened in previous generations with naturally infested soil, had been erroneously selected as resistant. The test tube cultures clearly differentiated lines carrying resistance from those which were susceptible and corroborated results from pot tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032073
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  • 11
    Electronic Resource
    Electronic Resource
    Gametocidal properties of RH-531, RH-532, RH-2956, and RH-4667 on spring wheat (Triticum aestivum L.) (1977)
    Springer
    Euphytica 26 (1977), S. 103-112 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; hybrid wheat ; male sterility ; cross pollination ; seed production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Several chemicals were evaluated for their gametocidal properties to control pollination in hybrid wheat (Triticum aestivum L. em Thell.) seed production. In a preliminary study, four chemicals were applied to three cultivars of spring wheat at two application times. RH-532 was the most effective of the four gametocides, reducing fertility to a 0 10% level for all three cultivars. In a second experiment, RH-532 was applied to one cytoplasmic male-sterile and three normal spring wheats at four rates (0.56, 1.12, 2.24, and 4.48 kg/ha) and at two times of application. Alternate strips of pollinator were planted throughout the experiment. All treatments decreased fertility. plant height, and spike length of the three normal wheats. RH-532 did not inhibit spike emergence of two semidwarf cultivars or one of conventional height. Cultivars did not respond similarly to treatments. Yields of cross-pollinated seed were only 1 21% of the normal yield when fertility levels on treated plants reached 0 10%. Hybrid seed content of the harvested seed ranged from 2 55%. On the treated male-sterile line, yield was significantly reduced in comparison with the open-pollinated check. Inhibitory properties of this chemical suppressed the fertilization potential of the female as well as inducing male sterility. The differential response of genotypes to treatments indicates that cultivars should be screened for male and female sensitivity to this chemical. If differential sensitivity is found, breeding and selection to improve this trait may be possible. Different environmental conditions may alter the response of cultivars to this chemical, with less effect on the female structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032075
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  • 12
    Electronic Resource
    Electronic Resource
    The crossing of common wheat (Triticum aestivum L.) with cultivated rye (Secale cereale L.). II. Fertilization and early post-fertilization developments (1977)
    Springer
    Euphytica 26 (1977), S. 287-297 
    Details
    ISSN: 1573-5060
    Keywords: Triticum aestivum ; wheat ; Secale cereale ; rye ; intergeneric cross ; fertilization ; early post-fertilization developments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Fertilization and early seed development was studied in the variety Chinese Spring of common wheat (Triticum aestivum L.) after pollination with rye (Secale cereale L.) and selfing, and in the common wheat variety Hope after selfing. In all three combinations the first pollen tube reached the micropyle in about 40 min after pollination. When pollinated with rye the migration of the sperm nuclei to the egg cell and the polar nuclei was delayed by about an hour. In the subsequent development until 72 hours after pollination the average cellular and nuclear doubling times of embryo and endosperm were about 16 and 8 hours for the interspecific combination. 18 and 9 hours for Chinese Spring selfed and 20 and 12 hours for Hope selfed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026990
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  • 13
    Electronic Resource
    Electronic Resource
    Determination of heavy metals in seawater and in marine organisms by flameless atomic absorption spectrophotometry. V. Methane pyrolysis treatment of the graphite tube atomizer (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 30-31 
    Details
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, Atomabsorption ; Methanpyrolyse zur Behandlung des Graphitrohr-Atomisators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439763
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  • 14
    Electronic Resource
    Electronic Resource
    Statistical investigations of interferences in graphite furnace atomic absorption spectroscopy (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 9-14 
    Details
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, Atomabsorption ; flammenlos, Störungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary In the first part different methods for studying interferences of the time dependent signal in flameless AAS are presented with emphasis on factorial designs in experimentation as opposed to the one-factor-at-a-time approach. An example of the statistical computations necessary for interpretation of a multifactor experiment is worked out and discussed in detail with special consideration of the explanation of first-order interactions. The influence of instrumentation upon determinations in the graphite furnace is dealt with in the second part: The temperature in the graphite furnace was measured with a pyrometer, a thermocouple and a Hg-thermometer. The results obtained with the pyrometer were in good agreement with the values given by the manufacturer. The stability of the AAS system was checked and found to be sufficient for the investigation of interferences.
    Notes: Zusammenfassung Im ersten Abschnitt werden die verschiedenen Möglichkeiten zur Untersuchung von Störungen des zeitabhängigen Signals bei der flammenlosen AAS aufgezeigt, wobei besondere Bedeutung den faktoriellen Versuchsplänen im Gegensatz zu einparametrigen Untersuchungen beigemessen wird. Ein Beispiel der statistischen Auswertung zur Interpretation eines Experiments mit mehreren Faktoren wird gebracht, und dabei besonderes Gewicht auf die Erklärung von Wechselwirkungen zwischen zwei Faktoren gelegt. Im zweiten Abschnitt werden die apparativen Einflüsse auf Messungen in der Graphitrohrküvette behandelt. Dazu wurde die Temperatur im Graphitrohr mit einem Pyrometer, einem Thermoelement und einem Quecksilberthermometer gemessen. Die Temperaturen, die mit der pyrometrischen Methode gefunden wurden, stimmen gut mit den vom Hersteller angegebenen Werten überein. Die Stabilität des AAS-Gerätes wurde überprüft: sie reicht für die Durchführung von Interferenzstudien aus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439759
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  • 15
    Electronic Resource
    Electronic Resource
    Statistical investigations of interferences in graphite furnace atomic absorption spectroscopy (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 97-103 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Cadmium ; Spektralphotometrie, Atomabsorption ; flammenlos, Störungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Interferences in the flameless determination of cadmium using the HGA 72 were studied for HCl, HNO3, H2SO4, HClO4 and HF and found to be depending on different thermal pretreatment. The interferences of cations were much smaller than for anions. The results are discussed with respect to thermal stability as well as atomization rate of the compositions under investigation. Special emphasis is put upon the presence of interactions between interferents, which in some cases can be used to eliminate interferences.
    Notes: Zusammenfassung Interferenzen, die bei der flammenlosen Bestimmung von Cadmium in der HGA 72 auftreten, wurden bei HCl, HNO3, H2SO4, H3PO4, HClO4 und HF studiert; die AbhÄngigkeit ihres Auftretens von der thermischen Vorbehandlung wird gezeigt. Interferenzen von Kationen sind kleiner. Die Ergebnisse werden im Hinblick auf die thermische StabilitÄt und die Atomisierungsgeschwindigkeit der Proben diskutiert. Besonders betont wird die Gegenwart von Wechselwirkungen zwischen Störungen, die manchmal auch benützt werden können, um Interferenzen auszuschalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539072
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  • 16
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    Statistical investigations of interferences in graphite furnace atomic absorption spectroscopy (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 183-190 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei ; Spektralphotometrie, Atomabsorption ; flammenlos, Störungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Interferences in the flameless determination of lead using the HGA 72 were studied for HCl, HNO3, H2SO4, H3PO4, HClO4, HF and for a number of cations. In certain instances interferents in just 1000-fold concentration over lead are shown to cause deviations in the lead signal. Many of the interferences are matrix-dependent themselves and can be reduced by matrix variations. Optimization of the thermal pretreatment can be used effectively to reduce random error and/or systematic errors. The thermal stability of lead compounds in the graphite furnace was sufficient for charring procedures up to 900° C for 20 s.
    Notes: Zusammenfassung Interferenzen, die bei der flammenlosen Bestimmung von Blei in der HGA 72 auftreten, wurden bei HCl, HNO3, H2SO4, H3PO4, HClO4, HF und einigen Kationen studiert. In gewissen Fällen reicht ein nur 1000 facher Überschuß des Störions, um Abweichungen vom Signal des Bleistandards hervorzurufen. Da das Auftreten von Interferenzen auch oft matrixabhängig ist, können Matrixvariationen zur Unterdrückung von Interferenzen eingesetzt werden. Die Optimierung des Temperaturprogrammes wird erfolgreich zur Beeinflussung des Zufallsfehlers und/ oder systematischer Fehler herangezogen. In der Graphitrohrküvette reichte die Stabilität der Bleiverbindung aus, um beim Veraschungsschritt die Temperatur bis auf 900° C (20 s) zu steigern.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423875
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  • 17
    Electronic Resource
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    Determination of mercury and mercury compounds in air and other non-corrosive gases (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 337-341 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Quecksilber in Luft, Gasen ; Spektralphotometrie, Atomabsorption ; flammenlos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Mercury is adsorbed on cellulose powder and activated charcoal. The contents of the adsorber are burnt in the oxy-hydrogen flame, and the mercury determined by the flameless atomic absorption procedure. The method is applicable to mercury present as metallic vapour, organo mercurical compounds and particulate matter containing adsorbed mercury compounds. The combustion step eliminates all possible non-atomic absorption interferences in the measuring procedure and ensures quantitative recovery of the mercury from the adsorption material. Quantitative adsorption recovery over a wide range of flow rate from 2–200 l/h allows the use of small battery operated pumps for personal monitoring, or vacuum pumps for high speed and large volume sampling. The range of flow rate makes isokinetic sampling conditions possible.
    Notes: Zusammenfassung Quecksilber wird an Cellulosepulver und Aktivkohle adsorbiert. Der Inhalt des Adsorbers wird in der Wasserstoff-Sauerstoff-Flamme verbrannt und das Quecksilber durch flammenlose Atomabsorption bestimmt. Die Methode erfa\t Quecksilber als Metalldampf, in Form von Organo-Quecksilberverbindungen sowie Quecksilberverbindungen, die an Staubpartikel adsorbiert sind. Die Verbrennung in der Wasserstoff-Sauerstoff-Flamme eliminiert Störungen durch nicht-atomare Absorption bei der AAS-Messung und garantiert die quantitative Erfassung des adsorbierten Quecksilbers. Die quantitative Adsorption über einen gro\en Bereich der Durchflu\geschwindigkeit von 2–200 l/h erlaubt batteriebetriebene Pumpen für die Quecksilbermessung „am Mann“, oder den Einsatz von Vakuumpumpen für die Probenahme bei hoher Durchflu\rate und gro\em Probenvolumen. Der gro\e Bereich der Durchflu\rate gestattet isokinetische Bedingungen für die Probenahme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00442352
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  • 18
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    Einsatz der flammenlosen Atom-Absorption (Graphitrohrküvette) zur Bestimmung von Kupferspuren in Stahl und anderen Metall-Legierungen nach Extraktion (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 1-8 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kupfer in Legierungen, Stahl ; Spektralphotometrie, Atomabsorption ; Graphitrohrküvette, Spuren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Bestimmung kleiner und kleinster Kupfergehalte in Stahl und anderen Metallegierungen durch Atomabsorptions-Spektralphotometrie wurde untersucht. Dabei konnte festgestellt werden, daß die bei Untersuchungen an wäßrigen Lösungen mit der Flamme auftretenden merklichen Interferenzen durch Begleitelemente völlig ausgeschaltet werden können, wenn das Kupfer mit Pb-DDTC in Chloroform extrahiert und der Extrakt mit der Graphitrohrküvette untersucht wird. Ferner wurde festgestellt, daß die Graphitrohrküvette der Flamme bei den Arbeiten mit organischen Lösungsmitteln erheblich überlegen ist, da von der Art der Lösungsmittel keine Einschränkung des Einsatzbereiches erfolgt. — Die Methoden der kontinuierlichen Veränderungen nach Job und des molaren Verhältnisses nach Yoe u. Jones zur Bestimmung der Komplexzusammensetzung konnten für das System Cu-DDTC auf das Arbeiten mit der Graphitrohrküvette übertragen werden.
    Notes: Abstract The determination of small and smallest amounts of copper in steel and other metal alloys by atomic absorption spectroscopy was investigated. It has been found, that the interferences caused by accompanying elements in the determination in aqueous solution with the flame can be completely removed by extracting the copper with Pb-DDTC in chloroform and determining this extract with the heated graphite atomizer. Moreover, it was recognised, that working with the heated graphite atomizer in organic solutions shows great advantages compared with the flame, because any solvent may be used. The methods of continuous variation by Job and the molar ratio by Yoe and Jones for the determination of the complex stoichiometry were transferred to the system Cu-DDTC by working with the heated graphite atomizer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439758
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  • 19
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    Silberhalogenide als Spurenfänger für Chelatkomplexe (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 15-21 
    Details
    ISSN: 1618-2650
    Keywords: Spurenanalyse ; Silberhalogenide als Spurenfänger für Chelatkomplexe ; Analyse von Mangan, Manganverbindungen ; Spektralphotometrie, Atomabsorption ; Komplexierung von Spuren mit Phenanthrolin, AgJ als Spurenfänger
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Nachweisvermögen der Flammen-AAS für Elementspuren wird in Gegenwart der Matrix Mangan erheblich herabgesetzt, so daß eine Abtrennung der Spuren bei der Reinheitskontrolle von Mangan und Manganverbindungen erforderlich ist. Dazu werden die Spuren mit 1,10-Phenanthrolin komplexiert und mit Silberjodid als Spurenfänger angereichert. Durch Erhitzen des abfiltrierten Silberjodids mit HNO3 gelangt man zu nahezu matrixfreien Spurenlösungen von 10 ml, in denen 9 Elemente (Fe, Co, Ni, Cu, Zn, Cd, Pb, Bi und Tl) durch Flammen-AAS bestimmt wurden. Bei Einwaagen von 5–10 g Mangan bzw. Manganverbindungen unterschiedlicher Oxidationsstufen werden — je nach Element — Nachweisgrenzen zwischen 0,01 und 1 ppm erreicht. Durch Aufkonzentrieren der Spurenlösung auf 1 ml und anschließende Bestimmung mit der „Injektionsmethode“ der Flammen-AAS gelangt man zu Nachweisgrenzen von 0,007–0,1 ppm.
    Notes: Abstract The power of detection of flame AAS for trace elements decreases considerably in presence of manganese. For the purity control of manganese and manganese compounds, therefore, it is necessary to separate the traces from the main component of the samples. For that purpose the traces were complexed by 1,10-phenanthroline and coprecipitated by silver iodide as trace collector. To receive a trace solution of 10 ml being free of manganese the filtered AgI was boiled with HNO3. The enriched elements (Fe, Co, Ni, Cu, Zn, Cd, Pb, Bi and Tl) were determined by flame AAS. Using samples of 5 to 10 g of manganese or manganese compounds of different stages of oxidation the limits of detection of the various elements were found to be in a range between 0.01 and 1 ppm. By evaporation of the trace solution down to 1 ml and determination of the traces by the “injection method” of flame AAS limits of detection are obtained between 0.007 and 0.1 ppm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439760
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  • 20
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    Effect of matrix components in the determination of lead in soils by atomic absorption spectrophotometry (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 283 (1977), S. 303-303 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei in Boden ; Spektralphotometrie, Atomabsorption ; Matrixeinfluß
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00437554
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  • 21
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    Bestimmung von Spurenverunreinigungen in Reinstphosphor durch Atomabsorptionsspektrometrie (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 19-21 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Verunreinigungen in Phosphor ; Spektralphotometrie, Atomabsorption ; Trennungen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Nach Oxydation der Probe zu H3PO4 mit HNO3/HCl werden die Kationen an einem stark sauren Kationenaustauscher gebunden, mit HCl eluiert und durch AAS bestimmt. Von den häufigsten Verunreinigungen des reinen roten Phosphors werden die Alkali- und Erdalkalielemente sowie die meisten Schwermetalle erfaßt. Fe und As werden nicht abgetrennt, Al nur teilweise. Fe und Al werden durch Extraktion ihrer Oxinate isoliert. As wird aus HBr mit Benzol extrahiert und über die AsH3-Reaktion bestimmt.
    Notes: Abstract After oxidizing the sample to H3PO4 with HNO3/HCl, the cations are absorbed on a strong acid cation exchange resin. They are eluted with HCl and are determined by AAS. Under the most commonly found impurities of high-purity red phosphorus, the alkali and alkaline earth elements and most of the heavy metals can be separated. Fe and As are not separated, Al is partially separated. Fe and Al are isolated by extraction of their 8-quinolinol compounds. As is extracted from HBr with benzene and is determined by means of the AsH3-method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464029
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  • 22
    Electronic Resource
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    Einige systematische Fehlerquellen bei der Bestimmung von Elementen im ng- und pg-Bereich mit der Atomabsorptionsspektrometrie mit flammenloser Anregung im Graphitofen (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 1-12 
    Details
    ISSN: 1618-2650
    Keywords: Spektralphotometrie, Atomabsorption ; flammenlos, systemat. Fehlerquellen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird versucht, an Hand ausgewählter Elemente (Fe, Co, Ni, Ag und Cd) schwerwiegende systematische Fehler bei der Bestimmung durch flammenlose Atomabsorptionsspektrometrie aufzuzeigen und deren Ursache zu diskutieren. Neben den Parametern des Temperaturprogramms und des Schutzgasstroms ist die Art und Struktur des Graphits, sowie dessen Reaktivität von entscheidendem Einfluß auf Empfindlichkeit und Nachweisvermögen des Verfahrens. „Depressionen“ bei der Verwendung stark saurer Analysenlösungen werden bestätigt und es wird versucht, diese im Zusammenhang mit der Reaktivität von Graphit zu erklären. An einem vereinfachten Modell wird der Einfluß organischer Lösungsmittel bzw. organischer Lösungen von Komplexbildnern wie Dithizon, NH4-DDTC und APDC auf die Atomisierung untersucht. Es wird diskutiert, ob die dabei registrierten „Depressionen“ Verluste sind, die durch die Bildung flüchtiger metallorganischer Verbindungen bereits bei Temperaturen ab 500° C entstehen. Besonders schwerwiegend sind diese Verlustreaktionen bei Anwesenheit halogenierter Kohlenwasserstoffe, wie an Hand der Reaktionen von Fe, Cd, Co, Ni und Ag mit Chloroform gezeigt werden kann.
    Notes: Abstract With selected elements (Fe, Co, Ni, Ag and Cd), the serious systematic errors inherent in flameless atomic absorption spectrometry are demonstrated and their origins are discussed. Besides the parameters of the temperature program and the inert gas stream, the type and structure of the graphite, as well as its reactivity have a decisive influence on the sensitivities and limits of detection of the technique. Depression of the signal is observed with the use of strongly acid solutions and it has been attempted to explain this in connection with the reactivity of the graphite. The influence of organic solvents and organic solutions of complexes with dithizone, NH4-DDTC and APDC on the atomization have been investigated with simplified examples. It can be presumed that the resulting depression of the signal is due to losses by the formation of volatile metal-organic compounds at temperatures above 500° C. Particularly large are the losses in the presence of hydrocarbon halides as can be demonstrated by the reaction of Fe, Cd, Co, Ni, and Ag with chloroform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464027
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  • 23
    Electronic Resource
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    Determination of traces of copper, nickel and cobalt by solvent extraction and atomic absorption spectrophotometry (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 284 (1977), S. 41-41 
    Details
    ISSN: 1618-2650
    Keywords: Best, von Kupfer, Nickel, Kobalt in Geolog. Material ; Spektralphotometrie, Atomabsorption ; Extraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00464033
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  • 24
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    Determination of heavy metals in seawater and marine organisms by flameless atomic absorption spectrophotometry (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 23-27 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Cadmium in Wasser ; Spektralphotometrie, Atomabsorption ; flammenlos, Kulturwasser-Meeresorganismen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary For the determination of cadmium in culture water from toxicological experiments with marine organisms direct flameless atomic absorption spectrophotometry seems to be an appropriate method, because it is less complicated than any combination with an extraction method. Unfortunately, it cannot be applied in the μg·l−1-range without modifications, because matrix effects lead to unacceptable variations in the results. It was found that these difficulties can be overcome by the addition of ammonium peroxodisulphate and sulphuric acid. A routine method basing on this effect has been developed.
    Notes: Zusammenfassung Zur Cadmiumbestimmung in Kulturwasser von toxikologischen Versuchen mit marinen Organismen scheint die direkte flammenlose Atomabsorptions-Spektralphotometrie besonders geeignet zu sein, denn sie ist weniger umständlich als jede Kombination mit einer Extraktionsmethode. Ohne Modifikationen kann die Direktbestimmung jedoch im μg/l-Bereich nicht eingesetzt werden, denn Matrixeffekte bewirken allzu starke Streuungen der Meßergebnisse. Es wird gezeigt, daß ein Zusatz von Ammoniumperoxodisulfat und Schwefelsäure zur Probenlösung eine deutliche Verbesserung bewirkt. Eine Routinemethode wurde entwickelt, bei der von diesem Effekt Gebrauch gemacht wird.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539523
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  • 25
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    Routinemäßige Bestimmung von Eisen im extremen Spurenbereich (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 317-319 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Eisen in Biolog. Material ; Spektralphotometrie, Atomabsorption ; Druckaufschluß
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634513
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  • 26
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    1-Phenyl-3-methyl-4-benzoylpyrazolone-5 as an extraction reagent for Cu, Zn, Ni, Co, Mn and Fe in AAS (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 62-62 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Kupfer, Zink, Nickel, Kobalt, Mangan und Eisen ; Spektralphotometrie, Atomabsorption ; Extraktion mit Phenylmethylbenzoylpyrazolon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00634325
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  • 27
    Electronic Resource
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    Determination of lead in plants (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 191-192 
    Details
    ISSN: 1618-2650
    Keywords: Best, von Blei in Pflanzen ; Spektralphotometrie, Atomabsorption ; Reduktion zu metall. Blei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A new method for determining the lead content of plants has been developed. The dried, ground sample of a plant is first heated in oxygen to decompose the organic material. The lead is then reduced in hydrogen to elemental lead which sublimes and condenses in a capillary. The sublimed lead is dissolved in nitric acid and the lead concentration is determined by atomic absorption spectroscopy.
    Notes: Zusammenfassung Das getrocknete und zerkleinerte Pflanzenmaterial wird im Sauerstoffstrom bei höherer Temperatur verascht. Nach Erhitzen im Wasserstoffstrom wird das Blei verdampft und im Kondensat durch Atomabsorptionsspektroskopie bestimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439470
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  • 28
    Electronic Resource
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    Anpassung der Wickbold-Apparatur an die Verbrennung schwerer Öle und gebrauchter Schmieröle für die Spurenbestimmung anorganischer Elemente (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 273-276 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Vanadium, Elementen in Schmierölen ; Spektralphotometrie, Atomabsorption ; flammenlos, Anpassung der Wickbold-Apparatur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Verbrennungsapparatur nach Wickbold wurde durch Veränderungen am Saugbrenner, am vorderen Flammenrohr, am Kühlsystem und durch Verwendung von Wirbelrohren und eines Überdruckventils der Verbrennung von Erdölprodukten, speziell von gebrauchten Schmierölen, angepaßt. Zur Überprüfung der Apparatur wurde Vanadium in einer synthetischen Testlösung bestimmt. Die Endbestimmung nach der Verbrennung erfolgte durch flammenlose Atomabsorptionsspektrometrie in einer Graphitrohrküvette nach Massmann.
    Notes: Summary The Wickbold combustion apparatus has been modified for decomposition of petroleum products, especially of used lubricating oils. Modifications were made concerning the suction burner, the front of the combustion chamber and the cooling system in conjunction with adding a mixing tube and a pressure limiting valve. The improved apparatus was tested by the vanadium determination in a synthetic sample. After combustion the measurement was performed by flameless atomic absorption spectroscopy using a Massmann graphite tube.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539394
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  • 29
    Electronic Resource
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    Zur Bestimmung der KieselsÄure durch Atom-Absorptions-Spektroskopie (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 288 (1977), S. 344-347 
    Details
    ISSN: 1618-2650
    Keywords: Best. von KieselsÄure ; Spektralphotometrie, Atomabsorption ; Auflösung mit Flu\sÄure, Einflu\ von Begleitstoffen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Zur analytischen Bestimmung der KieselsÄure bzw. des Siliciums durch AAS wird die Möglichkeit der praktisch verlustfreien Auflösung in Flu\sÄure-SalzsÄure in offenen PlastikgefÄ\en über Versuchsergebnisse bestÄtigt. Versuche zur überprüfung von Störungen der KieselsÄurebestimmung in solchen Lösungen durch die Gegenwart von Begleitstoffen zeigten keine Beeinflussungen der Me\ergebnisse. Nach der Anwendung der Analysenmethode zur Siliciumbestimmung in ausgewÄhlten Proben, deren KieselsÄuregehalte in Flu\sÄure löslich sind und ebenso in resistenteren Materialien, wurden die Ergebnisse denen durch klassische Bestimmungen ermittelten gegenübergestellt.
    Notes: Summary Silicic acid resp. silicon can be quantitatively dissolved in a mixture of hydrofluoric acid and hydrochloric acid in open plastic containers. The solution is suitable for quantitative analyses of the silicon content by atomic absorption spectrometry. It can be shown experimentally that the results are not influenced by the presence of other elements in the solution. A comparison has been made between the classical method of silicon analysis and atomic absorption spectrometry using samples containing readily soluble silicic acid and also natural ores which are rather difficult to dissolve.
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    URL: http://dx.doi.org/10.1007/BF00433750
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