多壁碳纳米管-铋膜电极微分电位溶出法测定涂料中的铅

摘要

Inlaide carbon nanotubes - bismuth film modified electrode was prepared based on glassy carbon electrode. The electrochemical behavior of Pb was investigated by potentiometric stripping analysis. A determination method of Pb in coatings was established. The results showed that at electrolysis potential of -1. 1 V and Hac - NaAc(pH =4. 60)buffer solution, the linear relation between the stripping peak (dt/dE) and the concentration of Pb langed from 0. 1 to 20 μg/L, with the detection limit 0. 5 μg/L and RSD and the recovery 3. 8% ~7. 1% and 95. 2% -98. 7% respectively for a sample test.%制备了嵌入式多壁碳纳米管膜玻璃碳电极,研究了铅在电极上的电位溶出行为,建立了嵌入式碳纳米管-铋复合膜电极测定铅的微分电位溶出分析法.结果表明:富集电位为-1.1V,HAc - NaAc(pH =4.60)缓冲溶液中,峰高与铅浓度在0.1 ～20.0 μg/L范围呈线性,检出限为0.5 μg/L,对实际样品进行测定,相对标准偏差(RSD)值在3.8％ ～7.1％之间,回收率在95.2％ ～98.7％之间.