银—过硫酸钾—藏红T体系催化光度法测定痕量银

Catalytic-Kinetic Spectrophotometric Determination of Trace Silver with a System of Silver-potassium Persulfate-safranine T

本文研究了在pH=4.5的HAC-NaAc介质中,以2,2’-联吡啶为活化剂,过硫酸钾氧化藏红T催化动力学光度法测定痕量银的新方法。本法检测限为7.0×10^(-4)mg/L;相对标准偏差为3.0％(n=9);线性范围为0.004～0.018mg/L。可用于测定氯化银的溶度积。

A new catalytic spectrophotometric method for the determination of trace silver has been delvelped in HAc-NaAc (pH=4.5)buffer medium.This method is based on the catalytic oxidation of safranine Tby potassium persulfate in the presence of 2,2'-dipyridyl as an activator.The detection limit is 7.0×10-4 mg/L,the relative standard deviation is 3.0%, the linear range of determination is 0.004-0.018 mg/L for Ag.This method has been successfully used to determine the solubility product of silver chloride.