Nafion-Coated Bismuth Film Electrodes for the Determination of Trace Lead and Cadmium in Herbal Medicines by Anodic Stripping Voltammetry

• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2008,（5）
• 页码范围: 847-853
• 页数: 7页
• 语种: 英文

摘要

A novel analytical procedure for the determination of Pb(Ⅱ)and Cd(Ⅱ)in herbal medicines bv differential pulseanodic stripping voltammetry(DPASV)on Nation-coated bismuth film electrode(NCBFE)was proposed and experimentally validated.Various experimental parameters.which influenced the response of the NCBFE to thesemetals in real samples.were optimized.The results showed that there were well-detined peaks of Pb and Cd in herb samples at deposition potential of-1.2 V and deposition time of 300 s.The analytical performance of the NCBFE was evaluated in the presence of dissolved oxygen,with the determination limits of 0.35 pg-L-1 for Pb and 0.72μg·L-1 for Cd and recoveries of 87.8%-105.4% for Pb and 89.5%-108.5% for Cd obtained from different sampies.The Pb and Cd concentrations in the studied samples have been also determined by graphite furnace atomic absorption spectrometry(GFAAS),suggesting that there was a satisfactory agreement between the two techniques,with relative errors lower than 6.5% in all cases.The great advantages of the proposed method over the spectroscopic method were characterized bv its simplicity,selectivity and short analysis time,simultaneous analysis of different metals and cost-efficiency.