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  • 11
    Electronic Resource
    Electronic Resource
    Chemical characteristics and genesis of the quartz-feldspathic rocks in the Archean crust of Greenland (1991)
    Springer
    Contributions to mineralogy and petrology 107 (1991), S. 163-179 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A total of 108 samples of meta-tonalites, metagranodiorites, granites and meta-tholeiites representing groups of Early to Late Archean age and different metamorphic history from SW and SE Greenland have been analyzed for Ca, K and 28 trace elements. There is no systematic change of the chemical composition with age observable. The results support petrologic experiments which suggest that tonalites and granodiorites (the most abundant rocks of the Archean crust) are partial melting products of a mafic lower crust. Modelling suggest that this crust consisted of garnet amphibolite derived from a source with a bulk composition resembling a slightly enriched rather than depleted mantle. The CeN/YbN ratio is above 10 in the majority of tonalites. Most samples have no Eu anomaly because of a balanced contribution from the minerals of a mafic rock (or a plagioclase-free source). The positive Eu anomaly of some granodiorites and of a minor proportion of tonalites can be explained as being caused by plagioclase accumulation during differentiation or by partial melting of plagioclase-rich fractions. Modelling with Zn excludes an origin of tonalitic melts by differentiation of basaltic to dioritic magmas. The Archean meta-diorites, meta-tonalites and meta-granodiorites from Greenland have generally lost some K and S relative to their suggested magmatic protoliths. Loss of Rb, Tl, Pb and K and relative gain of Ca, Sr, Ba and Sc connected with granulitization of meta-tonalites can be explained in the majority of cases by separation of about 25 percent granitic partial melt. High K/Rb, K/Pb, Zn/Cd and Nb/Th ratios of granulites plus low ratios of granites are almost in balance with intermediate ratios of amphibolite-facies tonalites. Retrogression of granulites into amphibolites was accompanied by introduction of Pb, Tl, Rb, Ba, Sr and K from Na-Cl-rich brines circulating on fractures. A comparison of the abundance of 24 elements (characterized by different compatibility) in the Archean crust of Greenland with the present bulk crust reflects only minor changes (Th, Nb) if at-all in the chemical composition of the continental crust since the Archean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00310705
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  • 12
    Electronic Resource
    Electronic Resource
    Loss of metals from pelites during regional metamorphism (1984)
    Springer
    Contributions to mineralogy and petrology 85 (1984), S. 116-132 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract In aluminous metapelites the ratio H2O+/K2O decreases with increasing metamorphic grade and degree of reaction. This ratio is a very practical indicator for the progress of the mineral reconstitution during progressive metamorphism. With decreasing values of the ratio H2O+/ K2O the Cu concentration and the following element ratios also decrease either continuously or in stepwise fashion: Tl/K2O, Ba/K2O, Pb/K2O, Bi/K2O, Hg/K2O, Sr/Na2O, Zn/(Fe2++Mg), Cd/(Fe2++Mg); Rb/K2O remains approximately constant. In the aluminous metapelites of the Damara Orogen in Namibia the following losses occur between the biotite isograd and anatexis: 61% Cu, 20% Tl, 34% Ba, 59% Pb, 86% Bi, 46% Hg, 30% Sr, 25% Zn, 31% Cd. Thus the potential of regional metamorphism to form hydrothermal deposits in the low grade environment should not be neglected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00371702
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  • 13
    Electronic Resource
    Electronic Resource
    Metalle in kommunalen Klärschlämmen (1982)
    Springer
    Naturwissenschaften 69 (1982), S. 88-89 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00441229
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  • 14
    Electronic Resource
    Electronic Resource
    Determination of bismuth, cadmium and thallium in 33 international standard reference rocks by fractional distillation combined with flameless atomic absorption spectrometry (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 294 (1979), S. 345-351 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Wismut, Cadmium, Thallium in Gesteinen ; Spektralphotometrie, Atomabsorption ; fraktionierte Destillation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The analysis of bismuth, cadmium and thallium in rock samples can be performed by flameless atomic absorption spectrometry, after separation and preconcentration by a volatilization technique. This method has the major advantage that small amounts of substance can be used with a minimum consumption of chemicals, so that sources of contamination are reduced. The detection limit for Bi and Tl is about 1 ppb and for Cd about 0.1 ppb in the rock. Depending on the content in the rock samples, the relative standard deviation is between 2 and 30%. Several attempts have been made to determine the yields of Bi, Cd and Tl from synthetic and natural samples.
    Notes: Zusammenfassung Die Bestimmung von Wismut, Cadmium und Thallium in Gesteinen kann mit der flammenlosen Atomabsorptions-Spektroskopie nach verdampfungsanalytischer Abtrennung erfolgen. Die Verdampfungsnalyse hat den Vorteil, daß bei geringem Reagentienverbrauch kleine Mengen analysiert werden können. Die Gefahr der Einschleppung von Verunreinigungen wird erheblich vermindert. Die Nachweisgrenze bezogen auf die Probe beträgt für Wismut und Thallium ca. 1 ppb und für Cadmium ca. 0.1 ppb. In Abhängigkeit von der Konzentration liegt die relative Standardabweichung zwischen 2 und 30 %. An synthetischen und natürlichen Proben sind die Ausbeuten an diesen Elementen bestimmt worden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00468520
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  • 15
    Electronic Resource
    Electronic Resource
    Determination of lead in geological and biological materials by graphite furnace atomic absorption spectrometry (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 295 (1979), S. 355-361 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei in Geolog. Material, Biolog. Material ; Spektralphotometrie, Atomabsorption ; Graphitrohrküvette
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Serious systematic errors inherent in the determination of lead in geological and biological samples by flameless atomic-absorption spectrometry are demonstrated. The reduced absorption of lead is due to partial interaction with alkaline, alkaline-earth and iron chlorides during the atomization stage. Incomplete dissociation of the volatile monochloride of lead in the gaseous phase reduces the absorption signal. An addition of 20% hydrogen to nitrogen (purge gas) diminishes signal suppression by removing the chlorine in form of volatile HCl. The detection limit is about 0.6 ppm in rocks and about 0.3 ppm in plant materials. Depending on the content in the samples the relative standard deviation is between 1 and 12%. The accuracy of the method was tested on 39 international standard reference samples.
    Notes: Zusammenfassung Schwerwiegende systematische Fehler bei der Bestimmung von Blei in geologischen und biologischen Materialien mit der Graphitrohrküvette werden aufgezeigt. Die Reaktion von Blei mit Alkali-, Erdalkali- und Eisenchloriden während der Atomisierungsphase führt zur Bildung von Bleimonochlorid, das nur unvollständig dissoziiert und eine Signalunterdrückung zur Folge hat. Ein Zusatz von 20% Wasserstoff zu Stickstoff als Spülgas vermindert die Signalunterdrückung, indem überschüssiges Chlor als Chlorwasserstoff entfernt wird. Die Nachweisgrenze liegt bei ca. 0,6 ppm für Gesteine und bei ca. 0,3 ppm für Pflanzenmaterialien. Je nach der Konzentration beträgt die relative Standardabweichung 1–12%. Die Genauigkeit der Methode wurde an 39 internationalen Standardreferenzproben überprüft.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00539703
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  • 16
    Electronic Resource
    Electronic Resource
    Schwefel in Waldböden Nordwest-Deutschlands und seine vegetationsabhängige Akkumulation (1980)
    Springer
    Plant and soil 54 (1980), S. 173-183 
    Details
    ISSN: 1573-5036
    Keywords: Accumulation ; Beech ; Organic sulfur ; Sulfate ; Soils under forest vegetation ; Spruce ; Total sulfur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Amounts of total sulfur and sulfate (NaHCO3-extractable) were determined in soil samples from 19 representative profiles under forest vegetation in the areas of pleistocene and of the triassic middle range mountains in Germany. The mean total sulfur contents in surface and subsurface samples were 278 and 136 μg S/g soil respectively. The total amount of sulfate and its fraction in the total sulfur was low in the surface samples. The subsurface soil samples of pH〉5 contained very little sulfate. The difference between total sulfur and NaHCO3-extractable sulfate described as nonsulfate fraction was mainly constituted by the fraction of organic sulfur. The mean C:N:S ratio (sulfur as nonsulfate) for samples with carbon content more than 2% was 225∶10∶1.14. Compared with the parent material there was an accumulation of S in the acid brown earths developed from loess. Comparison of the sites with beech and spruce vegetation showed that the amount of nonsulfate-sulfur was of the same magnitude in both sites, but the amount of sulfate was higher in the spruce area. Similar differences between a beech and a spruce site were also observed for soils developed from weathered sandstone. The high amounts of sulfate under spruce are probably the result of higher inputs in the area due to the ‘filtering action’ of the spruce trees on emitted SO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181843
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  • 17
    Electronic Resource
    Electronic Resource
    Die Bestimmung sulfidisch gebundenen Schwefels in Gläsern (1927)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 166 (1927), S. 299-305 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19271660127
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  • 18
    Electronic Resource
    Electronic Resource
    Die Bestimmung sulfidisch gebundenen Schwefels in Gläsern (1928)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 75 (1928), S. 133-136 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01388823
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  • 19
    Electronic Resource
    Electronic Resource
    Nachweis and Bestimmung des Eisens sowie seine Trennung von anderen Elementen (1929)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 76 (1929), S. 463-466 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01381853
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  • 20
    Electronic Resource
    Electronic Resource
    Determination of mercury in water, rocks, coal and petroleum with flameless atomic absorption spectrophotometry (1975)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 273 (1975), S. 197-201 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Quecksilber in Wasser ; Gesteinen, Kohle, Erdöl ; Spektralphotometrie, Atomabsorption ; flammenlos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A method for the quantitative determination of Hg in water, rocks, coal and petroleum is described. The Hg is separated from the sample by volatilization and formation of Au amalgam, redissolved and concentrated by electrolysis on gold cathodes. The gold cathodes are heated in the graphite atomizer such that the Hg is volatilized but the cathodes are preserved. The sensitivity of the method is high (0.05 ng/1 % absorption). A certain disadvantage is the long time required for the electrolysis. This, however, can be compensated, first, by the short time (a few minutes) required for the AAS measurement and second, by a rational working rhythm.
    Notes: Zusammenfassung Das Hg wird verdampfungsanalytisch abgetrennt, gelöst und elektrolytisch an Goldkathoden angereichert. Die Goldkathoden werden in der Graphitrohrküvette so aufgeheizt, daß das Hg abdampft, die Goldkathoden jedoch für weitere Messungen erhalten bleiben. Das Verfahren ist mit 0.05 ng/1 % Absorption sehr nachweisempfindlich. Während die Hg-Messung nur wenige Minuten dauert, muß mit Elektrolysezeiten von mindestens 10 h gerechnet werden. Bei hinreichend vielen Elektrolyseeinheiten und einem sinnvollen Arbeitsrhythmus fällt dieser Nachteil nicht so stark ins Gewicht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00453522
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