湿法消解-差分脉冲溶出伏安法测定食品中总Cr  

Wet digestion and differential pulse stripping voltammetry determination of total chromium in the millet

作　　者：刘亚芹[1,2] 闫珂[1,2] 魏福祥[1,2] 

机构地区：[1]河北科技大学环境科学与工程学院,河北石家庄050018 [2]河北省污染防治生物技术实验室,河北石家庄050018

出　　处：《河北科技大学学报》2015年第3期319-323,共5页Journal of Hebei University of Science and Technology

基　　金：国家自然科学基金(20106033)

摘　　要：采用HNO3-H2O2消解-电化学方法测定小米中的铬含量。在DTPA-HAc-Na Ac体系中铬（Ⅵ）离子在镀汞电极上形成汞齐从而得到氧化峰电流,考察能够满足电化学测定的前处理消解技术。结果表明,铬（Ⅵ）离子的消解液在温度130℃,硝酸10 m L,过氧化氢38 m L,p H值呈中性时能够得到很好的电化学测定结果,线性相关系数为0.99,回收率为90%~110%。方法可以用于米中痕量铬（Ⅵ）的测定。The chromium content of millet is measured by HNO3-H2O2 digestion and electrochemical method. In the DTPA- HAc-NaAc system, the oxidation peak current of amalgam formed by hexavalent chrome ion is obtained in the plating mercury electrode, and the pre-treatment technology of wet digestion can meet the electrochemical determination. The optimized detec- tion condition of electrochemical method for hexavalent chrome ion is 130 ℃ of digestion solution, 10 mL hydrogen peroxide, 38 mL nitric acid, and neutral of pH. The linear correlation coefficient of electrochemical method is 0.99, and the recovery of standard addition is 90-110%. This method can be used to trace chromium （Ⅵ） determination in millet.

关 键 词：电化学分析 铬(Ⅵ) 湿法消解 差分脉冲 溶出伏安法 

分 类 号：X836[环境科学与工程—环境工程]