阳极溶出伏安法快速测定谷物中的镉含量

Determination of Cadmium Content in Grain by Anodic Stripping Voltammetry

建立了一种阳极溶出伏安法快速测定谷物中的镉含量。样品经微波消解后,采用玻碳电极为工作电极,Ag/Ag Cl电极为参比电极,铂电极为对电极,测定谷物中镉含量,其检出限为0.4μg/L。采用标准加入法,平均回收率100%~104%;某一浓度样品同时测定6次,其变异系数2.43%。该方法稳定、快速和准确,可广泛用于粮食的安全事件应急监测。

An anodic stripping voltammetry method was established for fast determination of cadmium content in grain. Samples were dealt with microwave digestion, by using glassy carbon electrodes as working electrode, Ag/AgCl electrode as reference electrode and platinum electrode as counter electrode for determination of cadmium content in grain. The detection limit of meth- od was 0.4μg/L. A standard adding method was used and average recovery rate was between 100% and 104%. A sample of a certain concentration was determined for 6 times, with a coefficient of variation of 2.43%. This method was stable, rapid and accurate, and could be widely used in emergency monitoring of food safety accidents.