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Digitale Medien

Flame Atomic Absorption Spectrometric Determination of Arsenic After Volatilization of As(III) with Chloride Ions (1999)

Lopez-Molinero, A. ; Castillo, J. R. ; Chamorro Pascual, Pilar ; [weitere]

Springer

Microchimica acta 131 (1999), S. 225-230

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ISSN: 1436-5073

Schlagwort(e): Keywords. Arsenic determination; flame atomic absorption; chloride volatilization; insectide sample.

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/PL00013459

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Digitale Medien

Determination of As, Sb and Bi in high-purity copper by electrothermal atomic absorption spectrometry (1986)

Castillo, J. R. ; Löpez-Molinero, A. ; Sucunza, T.

Springer

Microchimica acta 88 (1986), S. 105-114

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ISSN: 1436-5073

Schlagwort(e): electrothermal AAS ; copper ; arsenic ; antimony ; bismuth

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01196692

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Digitale Medien

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)

Cacho Palomar, J. ; López Molinero, A. ; Ibañez, M.

Springer

Microchimica acta 88 (1986), S. 73-85

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ISSN: 1436-5073

Schlagwort(e): arsenazo ; calcium ; titration ; tristimulus-colorimetry

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: 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.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01196689

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