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Chloride-selective electrodes with poly(n-butyl acrylate) based membranes

机译：具有聚丙烯酸正丁酯基膜的氯化物选择电极

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Chloride-selective electrodes with tridodecylmethylammonium chloride ion-exchanger and poly(n-butyl acrylate) membrane were prepared. A significant advantage of these electrodes, compared to poly(vinyl chloride) based membranes is the lack of plasticizer which can contaminate samples due to leaching during long term measurements. Analytical parameters: linear response range, slope of dependence and detection limit were comparable to those characterizing poly(vinyl chloride) membrane sensors. However, the analytical characteristic of poly(n-butyl acrylate) membrane sensors was largely independent of the ion-exchanger content in the membrane and of the galvanostatic polarization applied. The selectivity pattern obtained showed that interferences for highly lipophilic anions were slightly more pronounced than for PVC membrane counterparts. Laser ablation with inductively coupled plasma mass spectrometry (LA-ICP-MS) studies of poly(n-butyl acrylate) membranes free from tridodecylmethylammonium chloride revealed a relatively high background content of chlorine-comparable with the amount purposely introduced to the membrane containing ion-exchanger. These impurities, regardless their chemical state, are affecting the response of the sensors obtained. The LA-ICP-MS data showed that while contact with Cl- containing solutions did not induce the coextraction of cations, salicylate interference is accompanied by high uptake of solution cations.
机译：制备了具有十三烷基甲基氯化铵离子交换剂和聚（丙烯酸正丁酯）膜的氯化物选择电极。与基于聚氯乙烯的膜相比，这些电极的显着优势是缺少增塑剂，该增塑剂会由于长期测量中的浸出而污染样品。分析参数：线性响应范围，依赖性斜率和检测极限与表征聚氯乙烯膜传感器的参数相当。但是，聚（丙烯酸正丁酯）膜传感器的分析特性在很大程度上与膜中离子交换剂的含量以及所施加的恒流极化无关。获得的选择性图谱显示，对高度亲脂性阴离子的干扰比对PVC膜对应物的干扰稍显着。激光消融-电感耦合等离子体质谱法（LA-ICP-MS）对不含氯化三十二烷基甲基铵的聚（丙烯酸正丁酯）膜的研究表明，氯的​​背景含量相对较高，与故意引入含离子膜的膜中的氯含量相当交换器。这些杂质，无论其化学状态如何，都会影响所获得传感器的响应。 LA-ICP-MS数据显示，虽然与含Cl的溶液接触不会诱导阳离子的共萃取，但水杨酸盐干扰却伴随着溶液阳离子的大量吸收。

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