铋膜电极电位溶出法测定痕量铅、镉、锌  

Determination of Lead, Cadmium, Zinc Using Bismuth-film Electrodes by Potentiometric Stripping Analysis

作　　者：李建平[1] 彭图治[1] 张雪君[1] 

机构地区：[1]浙江大学西溪校区化学系

出　　处：《分析化学》2002年第9期1092-1095,共4页Chinese Journal of Analytical Chemistry

摘　　要：研究了用铋膜电极替代汞膜电极测定痕量重金属元素铅、镉和锌的电位溶出法。实验了同位镀铋膜及测定重金属特别是痕量铅的条件。实验结果表明 :铅、镉、锌在铋膜电极上可得到灵敏的电位溶出峰 ,峰高和溶出电位与汞膜电极法相近。使用铋膜电极可避免使用汞电极带来的环境污染。利用铋膜电极电位溶出法测定了水样及血样中痕量铅的含量。A novel substitutive potentiometric stripping analysis (PSA) for the determination of Pb2+, Cd2+ and Zn2+ via bismuth-film electrode was proposed. In HAc-NaAc buffer solutions, the sensitive stripping peaks (dt/dE) of the ions were obtained and compared with that obtained using mercury-film electrodes. With 5 min deposition, the detection limits of Pb2+, Cd2+ and Zn2+ are 0.14, 0.46, 0.55. mug/L respectively. The method has been applied to determine trace lead in water samples and blood samples with satisfactory results.

关 键 词：测定 铋膜电极 电位溶出法 铅 镉 锌 痕量分析 水样 血样 

分 类 号：O657.1[理学—分析化学]