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首页> 外文期刊>Electroanalysis >Poly(catechol) film modified glassy carbon electrode for ultratrace determination of cerium(III) by differential pulse anodic stripping voltammetry
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Poly(catechol) film modified glassy carbon electrode for ultratrace determination of cerium(III) by differential pulse anodic stripping voltammetry

机译：差分脉冲阳极溶出伏安法测定聚（邻苯二酚）薄膜修饰的玻碳电极超痕量测定铈（III）

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摘要

Oxidative electropolymerization of resorcinol, catechol and pyrogallol at the glassy carbon electrode in different media such as 0.10 M NaOH, 0.10 M phosphate buffer (pH 7.00) or 0.10 M NaClO4 all gave water-insoluble films, adherent on the electrode surface. Amongst them electropolymerization of catechol at the GC electrode in 0.10 M NaOH provided a highly sensitive and selective film for Ce(III) and therefore, this poly(catechol) film modified glassy carbon electrode was exploited for the selective preconcentration of Ce(III) at open circuit, followed by its determination by differential pulse anodic stripping voltammetry both in batch and flow systems. Factors affecting the accumulation, stripping and removal steps were investigated and an optimized procedure was then developed. Under optimized conditions, for batch determination, the calibration plot was linear in the concentration ranges 2.00 x 10(-9) M-1.00 x 10(-8) M and 2.00 x 10(-8) M-1.00 x 10(-7) M Ce(III). A detection limit of 2.0 x 10(-10) M (0.027 ppb) (SN = 3) was found for a 10 min accumulation. For six successive determinations of Ce(III) at concentrations of 2.00 x 10(-7), 2.00 x 10(-8) and 2.00 x 10(-9) M, relative standard deviations were 3.36%, 1.76% and 4.08%, respectively. Similar results were obtained for continuous flow analysis. Interference from selected foreign ions and substances were examined. The developed method was applied to Ce(III) determination in human urine, both in batch and continuous flow systems. [References: 31]
机译：间苯二酚，邻苯二酚和邻苯三酚在玻璃碳电极上在不同介质（例如0.10 M NaOH，0.10 M磷酸盐缓冲液（pH 7.00）或0.10 M NaClO4）中的氧化电聚合均产生了水不溶性薄膜，该薄膜粘附在电极表面。其中，邻苯二酚在0.10 M NaOH中在GC电极上进行电聚合，提供了对Ce（III）的高灵敏度和选择性膜，因此，该聚（邻苯二酚）膜修饰的玻碳电极被用于选择性富集Ce（III）。开路，然后通过分批和流量系统中的差动脉冲阳极溶出伏安法进行测定。研究了影响积累，汽提和去除步骤的因素，然后开发了优化程序。在优化条件下，对于批次测定，校准曲线在2.00 x 10（-9）M-1.00 x 10（-8）M和2.00 x 10（-8）M-1.00 x 10（-7）浓度范围内呈线性M Ce（III）。发现10分钟的累积检出限为2.0 x 10（-10）M（0.027 ppb）（SN = 3）。对于2.00 x 10（-7），2.00 x 10（-8）和2.00 x 10（-9）M浓度的六次连续测定Ce（III），相对标准偏差为3.36％，1.76％和4.08％，分别。对于连续流分析，获得了相似的结果。检查了来自选定外来离子和物质的干扰。所开发的方法适用于间歇和连续流动系统中人尿中Ce（III）的测定。 [参考：31]

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