酸化トリオクチルホスフィン抽出法を用いるアルミニウム合金中の亜鉛のキレート滴定法
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概要
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A method for the determination of zinc in aluminum alloy by chelatometric titration after an extraction with TOPO-benzene was presented.<BR>The sample was taken up with hydrochloric acid, hydrogen peroxide and ammonium difluoride. The acid concentration was adjusted to 1.53.0<I>N</I>, and ferric ion was reduced to ferrous by ascorbic acid. Zinc was extracted twice with 20 m<I>l</I> of benzene solution containing 0.1 <I>M</I> TOPO by 3 min. shaking. Zinc. in the organic layer was back-extracted with 20 m<I>l</I> of perchloric acid (1+15) by 1 min. shaking.<BR>Ammonium fluoride and sodium thiosulfate were added to the back-extracted layer for masking, respectively, Al<SUP>3+</SUP> and Cu<SUP>2+</SUP>. After the adjustment of pH with hexamine, zinc was titrated with 0.01<I>M</I> or 0.005<I>M</I> EDTA solution by using XO as an indicator. Zinc in aluminum alloy was determined in 45 min. with sufficient accuracy and reproducibility.
- 社団法人 日本分析化学会の論文
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