Application of Heteropoly Compounds for Determination of Chemical Speciations of Arsenic in Natural Waters
O. S. KOSHCHEEVA1, O. V. SHUVAEVA1, D. V. SHTADLER2 and L. I. KUZNETSOVA2
1Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences,
Pr. Akademika Lavrentyeva 3, Novosibirsk 630090 (Russia) E-mail: olga@che.nsk.su
2Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Pr. Akademika Lavrentyeva 5, Novosibirsk 630090 (Russia)
Pages: 467-475
Abstract
The procedure has been developed to determine arsenate, arsenite, monomethylarsonate, and dimethylarsenite ions in water by the capillary electrophoresis method with spectrophotometric registration of detectable forms of arsenic derivatives. Isopolymolybdate has been selected as a reagent for derivatization. The stoichiometry has been studied and the extinction coefficients of the detected heteropoly complexes have been determined. Optimum conditions for their formation and for electrophoretic separation have been selected. Upon concentrating by the electrostacking method, the developed procedure affords the detection limits at a level of 0.01 mg/ml.
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