Selective substoichiometry for inorganic arsenic(V) by ion-pair extraction with pyrogallol/tetraphenyl-arsnium chloride and its application in the analysis of seaweed
✍ Scribed by Nobuo Suzuki; Fumiharu Jitoh; Hisanori Imura; Yukio Kanda
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 440 KB
- Volume
- 193
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Arsenic(V) is substoichiometrically extracted from 0.4-3 M sulfuric acid solutions into 1,2-dichloroethane with 1 .O X lo-' M tetraphenylarsqnium chloride in the presence of 2.0 x 10-l M pyrogallol. Reproducibility of the substoichiometric extractions with a constant amount of tetraphenylarsonium chloride is high (0.5% RSD). This substoichiometric extraction is very selective for arsenic(V) from arsenic(III), monomethylarsonic acid, and dimethylarsinic acid. The extraction combined with the isotope dilution principle was applied to the determination of arsenic(V) in an acid-digested solution of a seaweed sample (Laminaria religiosa Miyabe) and to the determination of total arsenic in this sample