辽宁石油化工大学学报 ›› 2012, Vol. 32 ›› Issue (2): 32-34.

• 石油化工 • 上一篇    下一篇

方波阳极溶出伏安法测定大米中的痕量镉

万素娟栾景合陈 平阎 松   

  1. 辽宁石油化工大学化学与材料科学学院,辽宁抚顺113001
  • 收稿日期:2011-12-04 出版日期:2012-06-25 发布日期:2017-07-06
  • 作者简介:万素娟(1963-),女,辽宁抚顺市,副教授

The Application of Square Wave Anodic Stripping Voltammetry to Measure the Trace Mount of Cadmium in Rice

WAN Su-juanLUAN Jing-heCHEN PingYAN Song    

  1. chool of Chemistry and Material Science, Liaoning Shihua Univercity, Fushun Liaoning 113001, P.R.China
  • Received:2011-12-04 Published:2012-06-25 Online:2017-07-06

摘要:      将大米用粉碎机粉碎成米粉,用混合酸浸泡(V(浓硝酸)∶V(浓硫酸)=3∶2)12h,在通风橱中缓慢加热,滴加混合酸及双氧水消解。以银基汞膜电极为工作电极,铂电极为对极,饱和甘汞电极为参比电极,利用方波阳极溶出伏安法测大米中的痕量镉。在pH=3.0的0.2mol/L NH4Cl底液中,峰电流与镉离子的质量浓度在0.01~0.12μg/mL内,峰电流与ρ(镉)呈良好的线性关系,线性回归方程为Ip=497.59c+15.324,相关系数为0.994 1,检出限为4.607 4×10-3μg/mL,相对标准偏差为4.12%~5.56%,加标回收率为90.26%~98.16%。

关键词: 方波阳极溶出伏安法 ,  大米 ,  镉

Abstract: Rice were grounded into rice powder by muller and soaked in mixed acid solution (concentrated nitric acid:concentrated sulphuric acid=3∶2) for 12 hours. Then, the mixture was heated slowly in a hood, and mixed acid solution and aqueous hydrogen peroxide solution were added for the digestion. In order to test the trace amount cadmium in rice with square wave stripping voltammetry method, a three-electrode system are used with the silver-based mercury film electrode as working electrode, platinum electrode as counter electrode, and saturated calomel electrode as reference electrode. The results show that a good linear relationship can be obtained in pH=3.0 NH4Cl(0.2 mol/L)substrate solution, within the concentration of cadmium 0.01~ 0.12 μg/mL; the regression equation was Ip=497.59c+15.324 with the correlation coefficient of 0.994 1, the detection limit of 4.607 4×10-3 μg/mL, the relative standard deviation of 4.12%~5.56%, and the recovery rate of 90.26%~98.16%.

Key words: Square wave stripping voltammetry , Rice , Cadmium

引用本文

万素娟,栾景合,陈 平,阎 松. 方波阳极溶出伏安法测定大米中的痕量镉[J]. 辽宁石油化工大学学报, 2012, 32(2): 32-34.

WAN Su-juan, LUAN Jing-he, CHEN Ping, YAN Song. The Application of Square Wave Anodic Stripping Voltammetry to Measure the Trace Mount of Cadmium in Rice[J]. Journal of Liaoning Petrochemical University, 2012, 32(2): 32-34.

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