PVC碳糊修饰电极测定Pb2+

Determination of lead with PVC paste carbon electrode

摘要: 介绍了一种用PVC碳糊电极测定Pb2+的方法.该法在开路电路条件,富集介质为0.1 mol/L KNO3(pH 11.0),检测底液为0.15 mol/L HNO3.用微分脉冲阳极溶出伏安法扫描,有一灵敏Pb氧化峰出现,峰电位为-0.496 V(vs.Ag/AgCl),溶出峰电流与Pb2+在1.0×10-7～2~2.0×10-5mol/L浓度范围内成很好的线性关系,线性相关系数为0.9960,检出限为5.0×10-8mol/L.

Abstract: The determination of lead with PVC paste carbon electrode(PVC-CPE) is presented.Under open circuit conditions,the PVC-CPE was soaked in an aqueous solution containing Pb2+(0.1mol/L KNO3 at pH11.0),then was scanned by a differential pulse voltammetry in the solution of HNO3 0.15mol/L.The anodic stripping votummogram was recorded,and an anodic peak at-0.496V(vs.Ag/AgCl) was observed.The detection limit was 5.0×10-8mol/L.The linear range was 1.0×10-7—2.0×10-5mol/L,and linear correlation coefficent was 0.9960.