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为什么离子选择性电极对欲测离子具有选择性?如何估量这种选择性?

问答题
2021-12-31 10:53
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正确答案

离子选择性电极是以电位法测量溶液中某些特定离子活度的指示电极。各种离子选择性电极一般均由敏感膜及其支持体,内参比溶液,内参比电极组成,其电极电位产生的机制都是基于内部溶液与外部溶液活度不同而产生电位差。其核心部分为敏感膜,它主要对欲测离子有响应,而对其它离子则无响应或响应很小,因此每一种离子选择性电极都具有一定的选择性。可用离子选择性电极的选择性系数来估量其选择性。


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