微分脉冲溶出伏安法测定食品中的苏丹红Ⅰ  

Determination of SudanⅠ with Differential Pulse Stripping Voltammetry

作　　者：李小庆[1,2] 李乐 刘成伦[1] 

机构地区：[1]重庆大学化学化工学院,重庆400044 [2]重庆化工职业学院,重庆400020

出　　处：《理化检验（化学分册）》2010年第6期657-659,共3页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：重庆市科委自然科学基金资助项目(CSTC;2007BB0200)

摘　　要：采用微分脉冲溶出伏安法测定食品中苏丹红的含量。在pH 5的B-R缓冲溶液底液中,当富集电位为-0.47 V,富集时间为180 s,扫描速度为50 mV.s-1时,苏丹红Ⅰ吸附在玻碳电极表面,于-0.43 V(vs.Ag/AgCl)电位处产生一灵敏还原峰。峰电流与苏丹红Ⅰ浓度在1.2×10-7～8.1×10-5mol.L-1范围内呈线性关系,检出限(3S/N)为4.0×10-8mol.L-1。方法用于辣椒粉样品分析,测得平均回收率为99.3%。A differential pulse cathodic stripping voltammetric method for determination of Sudan Ⅰin food was proposed.In a base solution of B-R buffer of pH 5,the adsorptive voltammetric behavior of Sudan I at the glassy carbon electrode was studied under the conditions of accumulation at the potential of-0.47 V（vs.Ag/AgCl） for 180 s with scanning rate of 50 mV·s-1,and a sensitive reduction peak was observed at-0.43 V（vs.Ag/AgCl）.Linear relationship between values of peak current and concentration of Sudan I was kept in the range of 1.2×10-7-8.1×10-5mol·L-1.Detection limit（3S/N） found for the method was 4.0×10-8mol·L-1.The method was applied to the analysis of pepper powder,giving value of average recovery 99.3%.

关 键 词：微分脉冲法 苏丹红Ⅰ 食品 

分 类 号：O657.1[理学—分析化学]