阳极溶出伏安法同时测定药用植物中的镉和铅
Simultaneous determination of cadmium and lead in medicinal plants by anodic stripping voltammetry.
作者信息
Mamani Mónica Cecilia Vargas, Aleixo Luiz Manoel, de Abreu Mônica Ferreira, Rath Susanne
机构信息
Institute of Chemistry, Department of Analytical Chemistry, State University of Campinas, P.O. Box 6154, 13084-971 Campinas, São Paulo, Brazil.
出版信息
J Pharm Biomed Anal. 2005 Apr 1;37(4):709-13. doi: 10.1016/j.jpba.2004.11.049. Epub 2004 Dec 29.
A simple method for the simultaneous determination of Cd and Pb in medicinal plants by differential pulse anodic stripping voltammetry, using a hanging mercury drop electrode, was developed. The pre-concentration of the metals was performed in 0.8 mol L(-1) HCl at -0.73V for 180s. The sample preparation was carried out by dry-ashing 1.0g of finely pulverized plant samples for 2.5h at 500 degrees C. The determination limit of the method was 0.12 and 0.010 mg kg(-1) for Pb and Cd, respectively. The method was applied to the quantification of cadmium and lead in samples of Hypericum perforatum, Mikania guaco, Mikania glomerata and Peamus boldus. The voltammetric method was shown to be useful for the control of contaminants in medicinal plants.
开发了一种使用悬汞滴电极通过差分脉冲阳极溶出伏安法同时测定药用植物中镉和铅的简单方法。金属的预富集在0.8 mol L(-1) HCl中于-0.73V下进行180秒。通过将1.0g精细粉碎的植物样品在500℃下干灰化2.5小时来进行样品制备。该方法对铅和镉的测定限分别为0.12和0.010 mg kg(-1)。该方法应用于贯叶连翘、马兜铃、伞房马兜铃和 Boldus 豌豆样品中镉和铅的定量分析。伏安法被证明可用于控制药用植物中的污染物。
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