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  • 1
    Electronic Resource
    Electronic Resource
    Field determination of molybdenum in soils (1997)
    Springer
    Fresenius' journal of analytical chemistry 357 (1997), S. 355-356 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new procedure for the field characterization of the available amount of molybdenum in soil extract is described. It is based on the preconcentration of the Mo(V)-SCN– complex into toluene solution of N-octylacetamide (OAA) and subsequent heating of the extract for ≈ 10 min at 60° C over a water bath. The molar absorptivity of the complex is (3.50) × 104 1 mole–1 cm–1 at λmax 470 nm. The detection limit of the method is 4 ppb Mo. It provides a significantly increased tolerance limit for iron (up to 1000 ppm) and is applicable to the field characterization of Mo in soil extracts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050168
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  • 2
    Electronic Resource
    Electronic Resource
    Some aspects of the magnetic susceptibility of ferroelectric magnesium hydrogen phosphate crystals (1989)
    Springer
    Journal of materials science 8 (1989), S. 1391-1392 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720197
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  • 3
    Electronic Resource
    Electronic Resource
    Caprolactam waste liquor degradation by various yeasts (1994)
    Springer
    World journal of microbiology and biotechnology 10 (1994), S. 524-526 
    Details
    ISSN: 1573-0972
    Keywords: Bioremediation ; carpolactam ; effluent ; waste liquor ; yeasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Waste liquor from caprolactam manufacture contains many mono- and di-carboxylic acids. Of four yeasts tested, Yarrowia lipolytica DS-1 was the best at decreasing Chemical Oxygen Demand values, by up to 60% with 50 and 100 g waste liquor/after 48 h. Caproic, butyric and valeric acids were utilized most easily. Adipic acid was not decreased below 13% (w/v).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367658
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  • 4
    Electronic Resource
    Electronic Resource
    Solvent extraction and spectrophotometric including graphite furnace atomic absorption determination of molybdenum in the environment (1996)
    Springer
    Microchimica acta 122 (1996), S. 259-265 
    Details
    ISSN: 1436-5073
    Keywords: molybdenum ; AAS ; solvent extraction of Mo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A selective and sensitive method for the extraction and microgram determination of molybdenum (VI) with hydroxamic acid as yellow molybdenum-hydroxamate complex from acidic medium is described. The molybdenum-PCPPSAHA complex has λmax 388 nm, molar absorptivity 5.0 × 103l mol−1 cm−1. The system obeys Beer's law in the range of 1–28 μg/ml of molybdenum(VI). Sandell's sensitivity is 0.0192 μg cm2 and stoichiometry of the complex is 1∶2, molybdenum: PCPPSAHA while mixed complex molybdenum-PCPPSAHA-morin has λmax 400 nm and molar absorptivity 5.9 × 103lmo1−1 cm−1 and stoichiometry of the complex is 1∶2∶1. The molybdenum is determined by graphite furnace atomic absorption spectrophotometry after directly pipetted the extract into the furnace which increases the sensitivity 20 fold.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245786
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  • 5
    Electronic Resource
    Electronic Resource
    Flow injection analysis of Zn and Co in beverages, biological, environmental and pharmaceutical samples (1998)
    Springer
    Fresenius' journal of analytical chemistry 362 (1998), S. 571-576 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple, rapid and selective flow injection analysis (FIA) method for the spectrophotometric quantification (speciation of inorganic and organic form) of Zn and Co with ammonium thiocyanate and malachite green (MG) in the presence of surfactants (CPC and TX-100) is described. The value of apparent molar absorptivity of the Zn- and Co- complexes are (1.23) × 104 and (8.67) × 103 L mol–1cm–1 at absorption maximum, 635 nm, respectively. The detection limit (amount causing a peak height 〉 3 s) is 15 ppb Zn and 20 ppb Co, whereas their optimum working ranges for the quantitative determinations are 0.05–2.0 ppm Zn and 0.07–2.5 ppm Co in the real samples. The sample thoughput of the method is 120 samples/h at the flow rate of 5.0 mL/min with rel. std. dev. of 〈 ± 1%. The method is free from interferences of almost all ions which are commonly associated with these metals in the complex materials. The composition of the complexes and their reaction mechanism involved are discussed. The effect of FIA and analytical variables for the determination of the metals are optimized. The method has been applied to the quantification of Zn and Co in beverages, biological, environmental, and pharmaceutical samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051126
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  • 6
    Electronic Resource
    Electronic Resource
    Graphite furnace-atomic absorption spectrophotometric determination of palladium in soil (2000)
    Springer
    Fresenius' journal of analytical chemistry 367 (2000), S. 738-741 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new and sensitive procedure for the graphite furnace-atomic absorption spectrophotometric (GF-AAS) determination of Pd in soil at nanogram level is described. The method is based on prior separation and enrichment of the metal as Pd(II)-SnCl3 –-N-butylacetamide (BAA) complex into 1-pentanol (PN) by solvent extraction method. The value of the molar absorptivity of the complex in three solvents, i.e. ethyl acetate, 1-pentanol, chloroform, lie in the range of (0.70–2.75) × 104 L mol–1 cm–1 at λmax 360–440 nm. The metal could be enriched into organic solvent, i.e. PN, up to 10-folds. The sensitivity (A = 0.0044) of the method in the term of the peak height was 0.5 ng Pd/mL of the aqueous solution at an enrichment factor (EF) of 5. Optimization of analytical variables during enrichment and GF-AAS determination of the metal are discussed. The method has been applied for the analysis of Pd to soil samples derived from roads and highways in Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160000483
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of antimony in rain water at the nanogram level with surfactant and brilliant green (1998)
    Springer
    Fresenius' journal of analytical chemistry 360 (1998), S. 270-272 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new, simple, selective and sensitive method for the spectrophotometric determination of antimony in rain water is described. It includes preconcentrating Sb with surfactants (i.e. cetylpyridinium chloride (CPC) and Triton X-100 (TX-100)) into toluene and allowing the extract to react with a dye, i.e. brilliant green (BG). The value of apparent molar absorptivity is 5.55 × 105 L-mol–1· cm–1 at λmax = 620 nm; the detection limit is 3 ng/mL Sb in rain water at 3-fold preconcentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050689
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  • 8
    Electronic Resource
    Electronic Resource
    Extraction-spectrophotometric determination of uranium(VI) with PAR and N-octylacetamide (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 152 (1991), S. 243-249 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A new and simple method for selective spectrophotometric determination of uranium(VI) with 4-(2-pyridylazo)resorcinol (PAR) and N-octylacetamide into benzene over pH 7.0–9.0 is described. The molar absorptivity of the complex with 9 different amides is in the range of (0.40–3.2)·104 1·mol−1·cm−1 at the absorption maximum. Out of these, the most sensitive compound N-octylacetamide (OAA) was chosen for detailed studies in the present investigation. The detection limit of the method is 0.008 μg U·ml−1. The system obeys Beer's law in the range of 0–5 μg U·ml−1. The method is free from interferences of most of the common metal ions except vanadium(V) and copper(II), which are masked by proper masking agents. The composition of the complex is determined by curve-fitting method. The method has been applied for the recovery of the metal from rock samples and synthetic mixtures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02042158
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  • 9
    Electronic Resource
    Electronic Resource
    Improved methodology for detecting bromodeoxyuridine in cultured cells and tissue sections by immunocytochemistry (1994)
    Springer
    Histochemistry and cell biology 102 (1994), S. 383-387 
    Details
    ISSN: 1432-119X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Detection of DNA synthesizing cells may often be achieved by immunocytochemical detection of bromodeoxyuridine (BrdU), which is rapid and appears to give similar results to those found using tritiated thymidine. However, the methodology for detection of BrdU involves a denaturation or digestion step to allow access of the antibody to BrdU incorporated into single- rather than double-stranded DNA. We wished to determine if microwave treatment could be used to enhance the detection of BrdU without the need for any other digestion/denaturation steps. An important consideration was to investigate whether such treatment produces a similar quantitative result, since BrdU detection is usually assessed on the basis of cell number rather than topographical distribution. We have found that microwave treatment can allow considerably lower antibody concentrations and eliminates the need for any other denaturation step. It also reduces the non-specific background staining found when using monoclonal antibodies on mouse tissue. We have performed cell counts and found that the number of BrdU positive cells remains constant for a range of different immunocytochemical parameters. We also report conditions where immunopositivity is adversely affected by changes in technique and describe the optimised conditions for obtaining reproducible results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00268909
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on active carbon: I. Preparation of active carbon from Kodrahusks using ZnCl2 as an activator (1960)
    Springer
    Naturwissenschaften 47 (1960), S. 41-42 
    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/BF00590747
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