湿法消解-差分脉冲溶出伏安法测定食品中总Cr

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。...

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Bibliographic Details
Published in河北科技大学学报 Vol. 36; no. 3; pp. 319 - 323
Main Author 刘亚芹 闫珂 魏福祥
Format Journal Article
LanguageChinese
Published 河北科技大学环境科学与工程学院,河北石家庄050018 2015
河北省污染防治生物技术实验室,河北石家庄 050018
Subjects
差分脉冲
湿法消解
溶出伏安法
电化学分析
铬（Ⅵ）
电化学分析
electrochemical analysis
wet digestion
stripping voltammetry
湿法消解
溶出伏安法
Cr(Ⅵ)
铬(Ⅵ)
差分脉冲
differential pulse
Online AccessGet full text
ISSN1008-1542
DOI10.7535/hbkd.2015yx03015

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Summary: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。
Bibliography:LIU Yaqin , YAN Ke , WEI Fuxiang （1. School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, Hebei 050018, China; 2. Pollution Prevention Biotechnology Laboratory of Hebei Province, Shijiazhuang, Hebei 050018, China）
13-1225/TS
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.
electrochemical analysis; Cr（VI）; wet di
ISSN:1008-1542
DOI:10.7535/hbkd.2015yx03015