Abstract

2-(N-pipyridino methyl)-1-cyano cyclohexanol was synthesized, characterized and used as an ionophore in construction of polyvinyl chloride (PVC) potentiometric sensor for Hg²⁺ determination. The best result was obtained with membrane composition of PVC (29%), sodium tetraphenylborate as ionic additive (1%), 2-(N-pipyridino methyl)-1-cyano cyclohexanol (12%) and dibutylphthalate (58%). The designed electrode showed an acceptable Nernstian slope (29.1 mV/decade) for Hg²⁺ over a wide concentration range from 5 × 10^–7 to 1 × 10^–2 M with a detection limit of 2.5 × 10^–7 M. The potential response was independent from pH in the range of 6.0–9.0 and the sensor response time was relatively short (~25 s). The sensor performance was invariable for at least 6 weeks. Electrode selectivity was evaluated by matched potential method. Finally, the proposed sensor was used as an indicator electrode in potentiometric titration of Hg²⁺ with ethylenediaminetetraacetic acid and in direct determination of mercury(II) in aqueous samples with admissible accuracy and high reproducibility.

中文翻译：

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基于2-（N-吡啶并甲基）-1-氰基环己醇作为新型中性载体的液膜汞选择性电极

摘要

合成了2-（N-吡啶基甲基）-1-氰基环己醇，表征并用作构建Hg ²⁺测定用聚氯乙烯（PVC）电位传感器的离子载体。用PVC（29％），作为离子添加剂的四苯硼酸钠（1％），2-（N-吡啶并甲基）-1-氰基环己醇（12％）和邻苯二甲酸二丁酯（58％）的膜组成可获得最佳结果。设计的电极在5×10 ^–7到1×10 ^–2 M的宽浓度范围内，对于Hg ²⁺表现出可接受的Nernstian斜率（29.1 mV /十倍），检测极限为2.5×10 ^–7M.电位响应在6.0-9.0范围内与pH无关，并且传感器响应时间相对较短（〜25 s）。传感器性能至少在6周内保持不变。通过匹配电位法评价电极的选择性。最终，该拟议的传感器用作乙二胺四乙酸电位滴定Hg ²⁺的指示电极，并以可接受的精度和高重现性直接测定水性样品中的汞（II）。