催化反应──导数示波极谱法测定痕量钨

Catalytic Determination of Trace Tungsten in Steel with Oscillopolarograpnic Detection

在盐酸介质中，痕量钨（Ⅵ）对钛（Ⅲ）还原金莲花橙ＯＯ的缓慢反应有强烈催化作用，在ＮａＯＨ介质中金莲花橙ＯＯ于－０．５０Ｖｖｓ·ＳＣＥ产生一灵敏的导数示波极谱波。据此，建立了一个检测限和测定范围分别为０．８ｎｇ／ｍＬ和１．６～８０９／ｍＬＷ的催化反应一示波极谱新方法，用于钢和矿样中钨的测定，获得满意结果。

Experiments Show W (Ⅳ) catalyses strongly the slow reaetion between Ti(Ⅲ) and tropaeolin OO in HC1 medium.Tropaeolin OO exhibits a senaitive derivstive oscillopolarographic wave at -0.50 V vs.SCE in the deporting electrolyte of NaOH.This provides a basis for devel opment of a new catalytic method for determining 1.6-80ng/mL W.The detection limit is 0.8ng/mL.W.Tungsten in steel and ore samples has been analyses by this method,with satisfactory results.