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  • 1
    Electronic Resource
    Electronic Resource
    Parakeratotic horns in a patient with Crohn's disease (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 14 (1989), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Horny finger-like lesions can be observed in many dermatoses. In some cases the clinical features suggest the diagnosis, but only the histological examination will confirm it. Our purpose here is to describe a case of multiple parakeratotic horns occurring in a patient with Crohn's disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.1989.tb00892.x
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  • 2
    Electronic Resource
    Electronic Resource
    Gaseous sample introduction for the determination of silicon by ICP-AES (1997)
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 599-603 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The generation of volatile species of silicon as a means to introduce silicon into an inductively coupled plasma has been studied. It is based on the reaction between silicon and fluoride ions in sulfuric acid media and it was carried out using different flow injection mountings. The first mounting works with an injection of 100 μL concentrated sulfuric acid and 150 μL silicon standard solution in a continuous 0.05 mol L–1 NaF solution flow. The method shows a linear response between the intensity of emission at 251.611 nm line and the silicon concentration from 0.1 to 200 μg mL–1, with a reproducibility of 2% and a detection limit of 0.004 μg mL–1. The second mounting produces the volatile species by the reaction between two opposed aerosol flows in a home-made nebulization chamber. This chamber has a Cross-Flow and a Meinhard nebulizer at either end. A linear response ranging from 0.1 to 1000 μg mL–1 of silicon solution is obtained and the reproducibility rises to 8%.The detection limit reached is 0.02 μg mL–1. The silicon content in real water samples was determined by applying both the above-mentioned methods and a third method for reference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160050476
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Arsenazo, 2-(4-arsonophenyl(azo-7-(4-antipyril)azo-1,8-dihydroxy-3,6-naphtalene disulphonic acid as reagent for calcium ions. New parameters for metallochromic indicator characterization (1986)
    Springer
    Microchimica acta 88 (1986), S. 73-85 
    Details
    ISSN: 1436-5073
    Keywords: arsenazo ; calcium ; titration ; tristimulus-colorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ca(II) ions react with arsenazo, 2-(4-arsonophenyl)-azo-7-(4-antipyril)azo-l,8-dihydroxy-3,5-naphtalene disulphonic acid, at pH 10.0 to produce a blue complex, with stoichiometry 1∶1, and stability constant of 6.64×105. Its molar absorptivity is 3.78×1041·mol−1 cm−1. This reagent has been used as metallochromic indicator in the complexometric titration of Ca. Its colour transition has been specified by tristimulus colourimetry. New parameters are defined and compared to Ringbom's parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196689
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  • 4
    Electronic Resource
    Electronic Resource
    Flame Atomic Absorption Spectrometric Determination of Arsenic After Volatilization of As(III) with Chloride Ions (1999)
    Springer
    Microchimica acta 131 (1999), S. 225-230 
    Details
    ISSN: 1436-5073
    Keywords: Keywords. Arsenic determination; flame atomic absorption; chloride volatilization; insectide sample.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract.  The generation of volatile species of As(III) as a means to introduce arsenic into a flame atomic absorption spectrometer has been studied. The method is based on the reaction between As(III) and chloride ions in sulphuric acid medium. The reaction is performed in a discontinuous or batch mode. With this method 130 μl of a solution containing 17.5% (w/v) sodium chloride and As(III) are injected by a 500 ml.min−1 N2 carrier gas flow into 1 ml of concentrated sulphuric acid. The gaseous compounds generated are introduced into the spectrometer through the nebulizer and As is determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013459
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of As, Sb and Bi in high-purity copper by electrothermal atomic absorption spectrometry (1986)
    Springer
    Microchimica acta 88 (1986), S. 105-114 
    Details
    ISSN: 1436-5073
    Keywords: electrothermal AAS ; copper ; arsenic ; antimony ; bismuth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract As, Sb and Bi were determined in copper electric cables by atomic absorption spectrometry with electrothermal atomization in a graphite furnace. The interferences in the determination of As, Sb and Bi caused by eleven cationic species and six types of acid were studied. The different volatilization of the copper matrix in comparison to the analyte was studied, as a means of increasing the analyte signal/non-specific absorption signal ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196692
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of ytterbium by AES-ICP. Application to samples of biological origin (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 331 (1988), S. 721-724 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Ytterbium is used as a marker in studies of digestion physiology in ruminants; its determination has been accomplished by Inductively Coupled Plasma — Atomic Emission Spectroscopy (ICP-AES). An analytical study has been carried out, which includes the evaluation of various emission lines (atomic, ionic). The line at 328.937 nm is proposed for determining Yb, with a limit of detection of 1.68 ×10−3μg ml−1. The analytical procedure has been applied to the determination of this element in samples of animal fodder, rumen contents and feces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01105607
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