以双核有机锡化合物为载体的PVC膜磷酸根离子敏感电极  

A PVC Membrane Electrode Sensing Phosphate Ion Based on Binuclear Organotin

作　　者：刘冬[1] 陈文灿[1] 何德良[1] 沈国励[1] 俞汝勤[1] 

机构地区：[1]湖南大学化学化工系

出　　处：《高等学校化学学报》1996年第10期1528-1531,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：以双（三苄基锡）氧化物为载体制备了一种对磷酸氢根离子具有良好电位响应性能的溶剂聚合膜离子敏感电极。在ｐＨ为７．２０±０．０２的测试液中，电极的线性响应范围为５×１０－６～１０－１ｍｏｌ／Ｌ，斜率为—３０．１ｍＶ／ｄｅｃ．．用分别溶液法测得其对于各种阴离子的选择性次序：ＨＰＯ～Ｉ－＞Ｂｒ－＞Ｃｌ－＞Ａｃ＞ＳＯ．膜相中荷电离子添加实验的结果表明，电极响应系中性载体作用机制。对比实验发现，双核有机锡化合物载体电极的电位响应能力较单核载体显著增强。Remarkable progress has been achieved in the development of electrodes sensing various anions since the introduction of quaternary ammonium salts as carriers.Question remains,however,as to the preparation of electrodes sensing the phosphate ion.In this report,bis(tribenzyltin) oxide is tested as a carrier for phosphate ions.Liquid membrane containing this carrier,o-nitrophenyl octyl ether as plasticizer,and poly(vinyl chloride)(PVC) as membrane matrix showed Nernstian response for hydrogen phosphate in the 5×10-6 mol/L to 10-1 mol/L activity range with a slope of-30.1 mV/dec.in pH=7.2±0.02 solutions.The electrode displayed selectivity patterns sequence:HPO～I->Br->NO>Cl->Ac->SO,which is not in accordance with the selectivity sequence pattern obtained from classical anion exchangers.Also included here is the comparison of potentiometric response characteristics between the binuclear and mononuclear organotin compounds,An enhanced response towards from binuclear compound based electrode was observed,showing that binuclear organometallic compounds may become a new promising class of carrier for anions.

关 键 词：有机锡 磷酸氢根 离子敏感电极 PVC膜 

分 类 号：O627.42[理学—有机化学] O657.15[理学—化学]