电化学法制备薄膜修饰电极及其铅的阳极溶出测定

Preparation of Film Modified Electrode by Electrochemical Method and Its Application for Anodic Stripping Voltammetric Determination of Pb(Ⅱ)

本文提出在邻氨基酚-甲醛-NaOH电解液中,用电化学方法处理玻碳电极,使电极对铅的测定灵敏度比未处理的玻碳电极提高60倍以上.电板的重复性好,相对标准偏差为3.7％(n=10)。铅的浓度在10ng/mL以下与其溶出峰高呈良好的线性关系,定量下限为0.2ng/mL.

In this paper we described the glassy carbon electrode treated by an electrochemical method in an aqueous solution containing the o-aminophenol,formaldehyde and sodium hydroxide.The sensitivity of the treated electrode for Pb2+ is about 60 times higher than that of untreated glassy carbon electrode.The electrode has a good reproducibility with a relative standard deviation of 3.7%(n=10).The anodic stripping peak height depends linearly on the Pb2+ concentration up to 10 ng/mL,and the quantitative limit with this electrode is 0.2 ng/mL.