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Nickel(II)-selective membrane electrode based on macrocyclic ligand

机译：基于大环配体的镍（II）选择性膜电极

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摘要

A polystyrene-based membrane of 3,4:11,12-dibenzo-2,5,10,13-tetraoxo-1,6,9,14-tetraazacyclohexadecane was prepared and investigated as a Ni2+-selective electrode. The best performance was observed with the membrane having polystyrene to ligand composition of 1:6, which worked well over a wide concentration range, 3.16 x 10(-6)-1.00 x 10(-1) mol L-1 with a near Nernstian slope of 30.7 mV per decade of activity between pH 2.5 to 7.0. The electrode exhibits a fast response time of 10s and was used over a period of 2 months with good reproducibility (S = +/- 0.2 mV). The selectivity coefficient values for monovalent, bivalent and trivalent cations indicate excellent selectivity for Ni2+ ions and it also works satisfactorily in a partially nonaqueous medium of methanol and ethanol. The practical utility of the membrane sensor was observed in solutions contaminated with detergents, cetyltrimethylammonium bromide and sodium dodecyl sulfate and the sensor was used successfully to determine nickel in electroplating waste. [References: 24]
机译：制备3,4：11,12-二苯并-2,5,10,13-四氧代-1,6,9,14-四氮杂环十六烷的聚苯乙烯基膜，并作为Ni2 +选择电极进行研究。在聚苯乙烯与配体组成为1：6的膜上观察到最佳性能，该膜在3.16 x 10（-6）-1.00 x 10（-1）mol L-1的宽浓度范围内均能很好地工作，并且接近Nernstian在2.5到7.0之间的每十倍活性30.7 mV的斜率。该电极具有10s的快速响应时间，并在2个月的时间内使用，具有良好的可重复性（S = +/- 0.2 mV）。一价，二价和三价阳离子的选择性系数值表明对Ni2 +离子具有极好的选择性，并且在甲醇和乙醇的部分非水介质中也能令人满意地工作。在被去污剂，十六烷基三甲基溴化铵和十二烷基硫酸钠污染的溶液中观察到了膜传感器的实用性，该传感器已成功用于测定电镀废料中的镍。 [参考：24]

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