Bare and Polymer-Coated Indium Tin Oxide as Working Electrodes for Manganese Cathodic Stripping Voltammetry.
Bare and Polymer-Coated Indium Tin Oxide as Working Electrodes for Manganese Cathodic Stripping Voltammetry.
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DOI：
10.1021/acs.analchem.5b03381
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发表时间：
2016-04-19
影响因子：
7.4
通讯作者：
Heineman WR
中科院分区：
文献类型：
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作者：
Rusinek CA;Bange A;Warren M;Kang W;Nahan K;Papautsky I;Heineman WR
虽然锰是人体必需的金属，但当发现过量时，锰（Mn）会对健康产生许多影响，这些影响会因长期暴露而放大。这些健康并发症包括神经毒性、记忆力丧失、男性不育和神经精神疾病-锰中毒的发展。因此，环境样品中的痕量检测越来越重要。很少有电极材料能够达到阳极溶出伏安法（ASV）所需的负还原电位，因此阴极溶出伏安法（CSV）已被证明是一种可行的替代方法。我们证明锰CSV使用铟锡氧化物（ITO）工作电极裸露和涂覆有磺化电荷选择性聚合物膜，聚苯乙烯-嵌段-聚（乙烯-然-丁烯）-嵌段-聚苯乙烯-磺酸盐（SSEBS）。ITO本身被证明是一个很好的电极材料锰CSV，实现了计算的检测限为5 nM（0.3 ppb）的沉积时间为3分钟。涂层的ITO与SSEBS聚合物被发现增加灵敏度和降低检测限为1 nM（0.06 ppb）。该聚合物修饰电极对Mn提供了优异的选择性，因为没有观察到来自所测试的其他金属离子（Zn 2+、Cd 2+、Pb 2+、In 3+、Sb 3+、Al 3+、Ba 2+、Co 2+、Cu 2+、Ni 3+、Bi 3+和Sn 2+）的干扰，除了Fe 2+，发现其以20：1的比率（Fe 2+：Mn 2+）干扰Mn 2+的分析信号。证明了该方法对自来水、河水和池塘水样品分析的适用性。这种简单，灵敏的分析方法，使用ITO和SSEBS-ITO可以适用于一些电活性过渡金属可检测的CSV。
Though an essential metal in the body, manganese (Mn) has a number of health implications when found in excess that are magnified by chronic exposure. These health complications include neurotoxicity, memory loss, infertility in males, and development of a neurologic psychiatric disorder- manganism. Thus, trace detection in environmental samples is increasingly important. Few electrode materials are able to reach the negative reductive potential of Mn required for anodic stripping voltammetry (ASV), so cathodic stripping voltammetry (CSV) has been shown to be a viable alternative. We demonstrate Mn CSV using an indium tin oxide (ITO) working electrode both bare and coated with a sulfonated charge selective polymer film, polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene-sulfonate (SSEBS). ITO itself proved to be an excellent electrode material for Mn CSV, achieving a calculated detection limit of 5 nM (0.3 ppb) with a deposition time of 3 min. Coating the ITO with the SSEBS polymer was found to increase the sensitivity and lower the detection limit to 1 nM (0.06 ppb). This polymer modified electrode offers excellent selectivity for Mn as no interferences were observed from other metal ions tested (Zn2+, Cd2+, Pb2+, In3+, Sb3+, Al3+, Ba2+, Co2+, Cu2+, Ni3+, Bi3+, and Sn2+) except Fe2+, which was found to interfere with the analytical signal for Mn2+ at a ratio 20:1 (Fe2+:Mn2+). The applicability of this procedure to the analysis of tap, river, and pond water samples was demonstrated. This simple, sensitive analytical method using ITO and SSEBS-ITO could be applied to a number of electroactive transition metals detectable by CSV.