抽出分離/原子吸光法による無機ヒ素化合物及びジメチルアルシン酸混合液中の無機ヒ素の定量

概要

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This study discussed a method for the determination of inorganic arsenic in arsenic compounds and dimethyl-arsonic acid (DMA) mixture by AAS after benzene extraction. The ion associate of arsenic (III) was extracted with benzene from hydrochloric acid solution (10〜20M) but neither arsenic (V) nor DMA were extracted. Titanium chloride (III) dissolved in concentrated hydrochloric acid was used to reduce arsenic (V) to arsenic (III). The reduction of 10μg of arsenic (V) was carrieed out by using 2ml of 10% titanium chloride (III) solution at 60℃ for 30min. As a result, the arsenic (V) was completely redured to arsenic (III) but the reduction of DMA was negligible. This method was applied to the determination of arsenic ion in oxidation degradation reaction products of wastewater containing DMA. The detection limit was 1μg/l and the relative standard deviation was 1.8% at 30μg/l.
社団法人日本分析化学会の論文
1990-03-05