银-过硫酸钾-钍试剂体系催化光度法测定痕量银  

Catalytic-Kinetic Spectrophotometric Deterimnation of trace Silver with a system of Silver - potassium persulfate -Thoron

作　　者：黄晓东[1] 陈毅挺[1] 

机构地区：[1]闽江学院化学与化学工程系,福建福州350011

出　　处：《福建分析测试》2005年第3期2209-2211,2214,共4页Fujian Analysis & Testing

基　　金：闽江学院院内科技育苗项目(YKY03003)

摘　　要：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,过硫酸钾氧化钍试剂催化动力学光度法测定痕量银的新方法。本法检测限为2.49×10-3μg/mL;相对标准偏差为3.3%(n=11);线性范围为0.004~0.048μg/mL。可用于测定黑白相纸液中的银和氯化银的溶度积。A new catalytic spectrophotometric method for the determination of trace silver has been developed in HAc-NaAc(pH=4.5)buffer medium. This method is based on the catalytic oxidation of thoron by potassium persulfate in the presence of 2,2'-dipyridyl as an activator. The detection limit is 2.49×10^(-3) μg/mL, the relative standard deviation is 3.3%, the linear range of determination is 0.004~0.048 μg/mL for Ag. This method has been successfully used to determine silver in the solution of the black-and-white photographical paper and the solubility product of silver

关 键 词：光度法测定 痕量银 钍试剂 过硫酸钾氧化 相对标准偏差 催化动力学 线性范围 黑白相纸 HAC 活化剂 联吡啶 检测限 溶度积 氯化银 介质 

分 类 号：O614.122[理学—无机化学] TQ153.2[理学—化学]