界面活性剤を可溶化剤とする1-(2-ピリジルアゾ)-2-ナフトール指示薬による亜鉛のEDTA滴定

概要

論文の詳細を見る
1-(2-Pyridylazo)-2-naphthol (PAN) reacts with zinc in an aqueous solution in the presence of a non-ionic surfactant, Brij 35, to form a soluble complex. The optimum condition for the EDTA titration of zinc with PAN indicator were studied. The formation constants of zinc-PAN chelate, and the acid dissociation constants of PAN in the presence of surface-active agent were investigated at 0.1 mol/1 (NaClO_4) ionic strength and at 30℃. The observed pH range to obtain sharp color change was decreased by pH 0.5 from calculated value by using the formation constants of zinc-EDTA chelate in the aqueous solution. The proposed procedure is as follows :To a sample solution containing of zinc (654μg), add 20ml of acetic acidsodium acetate buffer (pH 6.3), 1 ml of Brij 35(0.1 g/ml) solution and 0.2 ml of PAN(10^<-3> mol/1), and then titrate with EDTA(10^<-2> mol/1).
社団法人日本分析化学会の論文
1984-01-05