钒（Ⅴ）－（NH_4）_2S_2O_8－苯羟乙酸－OP催化增敏体系的示波极谱研究

Oscillopolarographic Study on the Catalytic System of V (Ⅴ)-(NH_4) _2S_2O_8-Benzoglycolic Acid-OP and Its Application

基于超痕量钒（Ⅴ）对（ＮＨ４）２Ｓ２Ｏ８氧化苯羟乙酸反应强烈催化作用，氧化产物苯甲醛于－０．９４Ｖ（ｖｓ．ＳＣＥ）处产生一灵敏的单扫描示波极谱波，表面活性剂ＯＰ具有增敏作用。据此建立钒的催化示波极谱分析新方法，线性范围２０～８０００／１０（１２）ｇ／ｍＬ，检测限为８×１０（－１２）ｇ／ｍＬ，用于铝合金分析，获得满意结果。

A novel and highly sensitive catulytic kinetic method for the determination of ultratrace amounts of vanadium has been developed, based on V(V) catalytic effect on the reactionbetween benzoglycolic acid and (NH4 )2S2O8 in sulphuric acid at 100℃. The oxidation product of benzoglycolic acid, benzadehyde, exhibits a sensitive oscillopolarographic wave at-0. 94 v vs.SCE as well as surfactant OP enhances the sensitivity for the wave. A detection limit of 8 ppt anddetermination range from 20 to 8000 ppt vanadium were obtained by the fixed--time procedure.The catalytic method has been applied to determine trace ammounts of vanadium in Al alloy andsteel samples, with excellent results.