Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Hexane Extraction of Arsenic(III) and Antimony(III) with O, O′-Diethyl Dithiophosphate1
Kenjiro HAYASHIYoshiaki SASAKIShoji TAGASHIRAYoshiko SOMAShinji KATO
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1986 年 2 巻 4 号 p. 347-350

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The conditional stability constant and the distribution constant of [M(dtp)3](M3+=As3+ or Sb3+, dtp-=O, O′-diethyl dithiophosphate) were determined by analyzing the relationship between the distribution ratio of arsenic or antimony and the concentration of dtp-. The values for arsenic(III) complex were 1011.2 (mol dm-3)-3(in 2mol dm-3 sulfuric acid solution) and 103.0, respectively. Those for antimony(III) complex were 1010.4(mol dm-3)-3 (in a solution of pH 1.6) and 102.4, respectively. Both arsenic(III) and antimony(III) were quantitatively extracted into hexane with Kdtp of 2mmol dm-3 from 1-2mol dm-3 sulfuric acid solution, only antimony(III) was extracted from a solution of pH 1.3-2.5, and neither of them was extracted at pH 4.2 or above. The separation method of arsenic(III) from antimony(III) and the reverse are proposed.

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© The Japan Society for Analytical Chemistry
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