酸化トリオクチルホスフィン抽出法を用いる電気炉ダスト中の亜鉛のキレート滴定法

概要

論文の詳細を見る
A method for the determination of zinc in dust by chelatometric titration after an extraction with TOPO-benzene was presented. The sample was taken up with hydrochloric acid and hydrogen peroxide. The acid concentration was adjusted to 1.53.0N, and ferric iron was reduced to ferrous by ascorbic acid. Thirty milliliters of the benzene solution of 0.1M TOPO was added, and zinc was extracted by 3 min. shaking. The aqueous layer was separated, and 20 ml of perchloric acid (1 + 15) was added to the organic layer for back-extracting zinc by 1 min. shaking. Hydrogen peroxide, ammonium fluoride and sodium thiosulfate were added to the back-extracted layer for masking, respectively, traces of Fe2+, Al3+ and Cu2+. After the adjustment of pH with hexamine, zinc was titrated with 0.02M EDTA solution by using XO as an indicator. Zinc in dust was determined in 40 min. with sufficienc accuracy and reproducibility.
社団法人日本分析化学会の論文