摘要
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.
基金
中科院长春应化所电分析化学开放研究实验室基金
关键词
化学修饰电极
银
NAFION
石墨炉AAS
Chemically modified electrode
Graphite furnace atomic absorption spectrometry
Silver
Nafion