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Calixarene/Nafion-Modified Bismuth-Film Electrodes for Adsorptive Stripping Voltammetric Determination of Lead

机译:杯芳烃/ Nafion修饰的铋膜电极用于吸附溶出伏安法测定铅

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摘要

This paper presents an enhanced adsorptive stripping voltammetric procedure (AdSV) for the determination of Pb2+ which relies on the accumulation of the metals at a calixarene-based chemically modified bismuth-film electrode on glassy carbon substrate. Following the accumulation of the target metals at open circuit and a medium exchange, both the square wave anodic stripping detection of the metal ions and the in situ bismuth-film formation was performed simultaneously in a Bi3+ containing supporting electrolyte. The analysis of Pb2+ under optimized conditions resulted in stripping responses with good linearity (in the range 0.05-0.6 mu M) and precision (RSD = 1.12% at 0.2 mu M Pb2+; n = 10) and low detection limit (0.02 mu g/L at 10 min preconcentration). The determination of Pb2+ (0.4 mu M) at 100-fold excess of interfering ions (Cd2+, Cu2+ and Zn2+) yielded well resolved lead signal. The analytical utility of the method elaborated was tested in the analysis of trace Pb2+ in environmental water samples.
机译:本文介绍了一种增强的吸附溶出伏安法(AdSV),用于测定Pb2 +,该方法依赖于杯状碳烯基化学修饰的铋膜电极在玻璃碳基底上的金属积累。在目标金属在开路和介质交换时积累之后,在含Bi3 +的支持电解质中同时进行金属离子的方波阳极剥离检测和原位铋膜形成。在最佳条件下分析Pb2 +可得到具有良好线性(在0.05-0.6μM范围内)和精密度(0.2μMPb2 +时,RSD = 1.12%; n = 10)和低检测限(0.02μg/ g)的剥离反应L在10分钟预浓缩)。在100倍过量的干扰离子(Cd2 +,Cu2 +和Zn2 +)下测定Pb2 +(0.4μM),可产生良好分离的铅信号。在分析环境水样中的痕量Pb2 +时,测试了所阐述方法的分析实用性。

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