多壁碳纳米管-铋膜电极微分电位溶出法测定涂料中的铅

Determination of Pb in Coatings by Differential Potentiometric Stripping Analysis Using Inlaide Carbon Nanotubes-Bismuth Film Modified Electrode

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-1.1 V,HAc-NaAc(pH=4.60)缓冲溶液中,峰高与铅浓度在0.1～20.0μg/L范围呈线性,检出限为0.5μg/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。

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.