单扫描示波极谱法测定中草药中铅和镉
Single Sweeping Oscillopolarographic Determination of Lead and Cadmium in Chinese Herbal Medicines
摘 要
以盐酸-碘化钾-酒石酸钾钠-抗坏血酸-聚乙二醇-400为底液，用二阶导数示波极谱法连续测定中草药中铅和镉.铅的回归方程为Iy=4 292Cx+46.78,质量浓度在0.004~0.50 mg·L-1范围呈线性关系，相关系数为0.998 0；镉的回归方程为Iy=6 833Cx+2.344，质量浓度在0.003~0.40 mg·L-1范围呈线性关系,相关系数为0.999 4.对不同浓度的样品进行了7次平行测定，铅、镉的相对标准偏差分别为1.1%~4.5%和1.6%~4.1%，回收率分别为94.0%~100.5%和97.0%~103.0%.分析了5种中草药样品与石墨炉原子吸收光谱法的结果一致.
中草药
铅
镉
Single-sweeping oscillopolarography
Chinese herbal medicine
Lead
Cadmium
Abstract
In a base solution of 6×10-3mol·L-1 HCl containing ascorbic acid,potassium iodide,sodium potassium tartrate and poly-ethylene glycol (PEG) 400,trace amounts of lead and cadmium in 5 kinds of Chinese herbal medicines were determined successively by the single-sweeping oscillopolarography.Linear relationships between the peak current (I″p) and the concentration of lead and cadmium were obtained in the ranges of 0.004-0.50 mg·L-1 (r=0.998 0) and 0.003-0.40 mg·L-1 (r=0.999 4) respectively.Precision was tested at different concentration levels of both element,and values of RSD′s (n=7) obtained were in the ranges of 1.2%-4.5% (for Pb) and 1.6%-4.1% (for Cd).Results of recovery test were in the ranges of 94.0%-100.5% (for Pb) and 97.0%-103.0% (for Cd).In the analysis of 5 kinds of Chinese herbal medicines,results obtained checked quite well with the results found by GF-AAS methods.
中图分类号 O637.31
所属栏目 工作简报
基金项目
收稿日期 2006/1/25
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备注陈爱英(1973-),女,辽宁人,博士,主要研究方向为食品分析和环境污染分析.
引用该论文: CHEN Ai-ying,WANG Xue-ying. Single Sweeping Oscillopolarographic Determination of Lead and Cadmium in Chinese Herbal Medicines[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2007, 43(8): 642～643
陈爱英,汪学英. 单扫描示波极谱法测定中草药中铅和镉[J]. 理化检验－化学分册, 2007, 43(8): 642～643
被引情况:
【1】郎春燕,赖晨焕,张晓,孙县荣, "氢化物发生-原子荧光光谱法测定环境水样中痕量镉",理化检验－化学分册 46, 1165-1167(2010)
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