Nafion修饰电极预富集-石墨炉原子吸收法测定痕量银的研究

Nafion Modified Electrode Preconcentration-Graphite Furnace Atomic Absorption Spectroscopic Determination of Trace Silver

本文报道了用Nafion修饰电极预富集-石墨炉原子吸收法测定痕量银的方法。采用不加电位的离子交换富集方法,将痕量银富集在Nafion修饰钨丝电极上,然后用石墨炉原子吸收法测定,检出限为0.04ng/ml,线性范围为0.08～12ng/ml,RDS为4.2%,回收率为88～100%。方法简便、灵敏,选择性好,适用于测定复杂体系中的痕量银。

A method for the determination of trace silver With a Nafion modified electrode preconcen- tration-graphite furnace atomic absoption spectrometry is reported. Trace silver is preconcen- trated onto the Nafion modified tungsten wire electrode by ion-exchange means without apply- ing electrode potential. The following graphite furnace atomic absorption spectrometric determin- ation of silver gives a detection limit of 0.04ng/ml, and a linear range of 0.08 to 12ng/ml. The relative standard deviation is 4.2% and the recovery is 88-100%. This is a simple, sensi- tive and selective method, especially suitable for the determination of trace silver in complica- ted system.