铋膜丝网印刷电极现场快速测定工业废水中Pb^(2+)、Cd^(2+)

Bismuth-coated screen printed electrode for on-site detection Pb^(2+) and Cd^(2+) in industrial wastewater

采用丝网印刷电极,通过同位镀铋膜阳极溶出伏安法对工业废水中重金属Pb2+和Cd2+进行了快速测定,考察并优化了镀铋膜及测定金属离子的实验条件.实验结果表明,Pb2+和Cd2+在铋膜电极上可得到灵敏的溶出峰,在优化的实验条件下Pb2+和Cd2+在50—500μg.L-1范围内呈现良好的线性关系,相关系数分别为0.9947、0.9969,检测限分别为4.45μg.L-1和2.98μg.L-1.测定了工业废水中的Pb2+、Cd2+,结果与ICP-MS方法一致.

In this paper, in-situ plating bismuth film coupled to screen-printed electrode were used to determine heavy metals Pb2＋ and Cd2＋ in industrial water by anonic stripping voltammetry. The conditions which influence the determinnation of heavy metals were investigated. The experimental results show sensitive stripping peaks of Pb2＋ and Cd2＋. Under the optimized conditions, Pb2＋ and Cd2＋ presents a good linear relationship from 50 to 500 μg.L^-1 range, the correlation coefficients were 0.9947 and 0.9969, the detection limits were 4.45 μg.L^-1 and 2.98 μg.L^-1. This method used to determine trace Pb2＋ and Cd2＋ in industrial wastewater was good agreement with ICP-MS.