塩化第二鉄エッチング溶液中の遊離酸の定量

概要

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Free acid in ferric chloride solution for chemical milling of metal plates is determined titrimetrically by using a pH meter. The method is characterized by the masking, before the titration, of such interfering ions as Ni2+, Cu2+, Fe2+, and Fe3+ with potassium oxalate as a complexing agent. The established procedure is as follows : 25 ml of a sample solution is added to 80ml of 10% potassium oxalate solution, pH of which has been previously adjusted to 6. The mixture is then titrated with 0.05N sodium hydroxide solution to pH 6. From 0.05 to 0.5N free acid is determined in less than 15 min. within ± 2.0% relative error. The method can be applied also to the samples containing more than 1.5% (wt/vol) of ferrous ion, to which the JIS method is inapplicable.
社団法人日本分析化学会の論文