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研究了双核三苄基甲醇锡(Ⅳ)对苯二甲酸酯配合物［Sn(Ⅳ)-BTMTT］为中性载体的PVC膜阴离子选择性电极。这类电极对硫氰酸根离子呈现出优良的电位响应性能和选择性,并呈现反Hofmeister序列行为。其选择性序列为:SCN-＞I-＞Ac-＞－NO＞2－2NO＞－4ClO＞Cl-＞3－4SO,该电极在pH＝3.0的磷酸盐缓冲体系中对SCN-在0.1～8×10-5mol／L浓度范围内呈超能斯特响应,斜率为-77.3mV／dec,检出限为4.0×10-5mol／L。采用交流阻抗及紫外光谱研究了阴离子与载体的作用机理。该电极具有响应快、重现性好、制备简单等优点。将该电极用于废水分析,结果令人满意。
A PVC membrane anion selective electrode with a binuclear tribenzyl tin (IV) terephthalate complex [Sn (Ⅳ) -BTMTT] as a neutral carrier was studied. Such electrodes exhibit excellent potential response performance and selectivity for thiocyanate ions and exhibit anti-Hofmeister sequence behavior. The selective sequences of SCN-> Ac-> NO-> 2-2NO> -4ClO> Cl-> 3-4SO are as follows: SCN- In the range of 8 × 10-5mol / L, there was a hypersensitive response with a slope of -77.3mV / dec and a detection limit of 4.0 × 10-5mol / L. The mechanism of interaction between anion and carrier was studied by AC impedance spectroscopy and ultraviolet spectroscopy. The electrode has the advantages of fast response, good reproducibility, simple preparation and the like. The electrode was used in wastewater analysis and the results were satisfactory.