铋膜电极测定辣椒制品中苏丹红Ⅱ的研究

用循环伏安法(CV)、线性扫描伏安法(LSV)研究了苏丹红Ⅱ在铋膜电极上的电化学行为。结果表明,在最佳条件下,BR缓冲溶液(pH=2),无水乙醇作助溶剂(体积分数27.5%),苏丹红Ⅱ在-0.50附近有一灵敏还原吸收峰。用线性扫描伏安法测定标准品,扫描速度为100 mV/s,浓度在7.49×10-6~1.87×10-5范围内和峰高呈线性关系。回归线方程:pí=1.722 2+0.751 7c(×10-3mmol/L),r=0.994 8。检出限为3.74×10-4mmol/L。据此建立了一种快速、简便测定苏丹红Ⅱ的方法。

Determination of sudan Ⅱ in chile with bisthmuth film electrode

The electrochemical of sudanⅡat a bisthmuth film electrode by cyclic voltammetry and linear sweep voltammetry has been studied.In the buffer solution of BR(pH = 2.0)and ethanol(Cv=27.5%),sudanⅡproduced a reductive peak at-0.5 V,peak current showed a well linear relationship with concentration of sudanⅡin the range of 7.49×10-6～1.87×10-5 mol/L,and regression equation íp= 1.722 2+ 0.751 7C(×10-3 mmol/L).The limit detection is 3.74×10-4 mmol/L,with the correlation coefficient of 0.994 8.This method can be applied to determine sudanⅡ.