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首页> 外文期刊>Electroanalysis >Comparative Study of Lead(II) Selective Poly(vinyl chloride) Membrane Electrodes Based on Podand Derivatives as Ionophores
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Comparative Study of Lead(II) Selective Poly(vinyl chloride) Membrane Electrodes Based on Podand Derivatives as Ionophores

机译：基于Podand衍生物作为离子载体的铅（II）选择性聚氯乙烯膜电极的比较研究

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摘要

The two podand chelates based on diethylsulfide, 1,5-bis(2′-hydroxy-4′-nitrophenoxy)-3-thiapentane (L_1) and 1,5-bis(8′-oxybenzopyridine)-3-thia pentane (L_2), have been synthesized and explored as neutral ionophores for preparing poly(vinyl chloride) based membrane electrodes selective to Pb~(2+). The addition of anionic additives and various plasticizers has been found to substantially improve the performance of the electrode. The best performance was obtained with the electrode No.1 having a membrane of ionophore (L_1) with the composition PVC:o-NPOE:ionophore (L_1):NaTFPB (%w/w) of 33:62:3:2. The electrode exhibits Nernstian response with a slope of 31.57±0.3mV decade~(-1) of activity in the concentration range from 2.0×10~(-9) to 1.0×10~(-1)M Pb~(2+), performs satisfactorily over a wide pH range (1.6-7.0), with a fast response time (5s).
机译：基于二乙基硫，1,5-双（2'-羟基-4'-硝基苯氧基）-3-噻戊烷（L_1）和1,5-双（8'-氧基苯并吡啶）-3-硫杂戊烷（L_2）的两种豆荚螯合物）已被合成并作为中性离子载体用于制备对Pb〜（2+）有选择性的聚氯乙烯基膜电极。已经发现添加阴离子添加剂和各种增塑剂可实质上改善电极的性能。用具有离子载体膜（L_1），组成PVC：o-NPOE：离子载体（L_1）：NaTFPB（％w / w）为33：62：3：2的No.1电极可获得最佳性能。在2.0×10〜（-9）到1.0×10〜（-1）M Pb〜（2+）的浓度范围内，电极表现出能级为31.57±0.3mV十进位〜（-1）的Nernstian响应。在很宽的pH范围（1.6-7.0）内表现令人满意，响应时间很短（5s）。

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