锇(Ⅳ)-KIO_4-偶氮氯膦-pA催化光度法测定微量锇  

CATALYTIC PHOTOMETRIC DETERMINATION OF OSMIUM BY THE REACTION SYSTEM OF Os(Ⅳ)-KIO_4-CPA-pA

作　　者：李欣[1] 陈立仁[1] 石小平[2] 

机构地区：[1]中国科学院兰州化学物理研究所,兰州730000 [2]甘肃教育学院化学系,兰州730000

出　　处：《理化检验（化学分册）》2005年第7期495-496,共2页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：甘肃省教育厅资助项目

摘　　要：在1.0mol.L-1硝酸介质中,微量锇(Ⅳ)对KIO4氧化偶氮氯膦-pA的褪色反应有明显的催化作用,利用此反应可在水相中直接测定微量锇。锇(Ⅳ)含量在0.02~0.60mg.L-1范围内符合比耳定律,检出限为0.01mg.L-1。A new catalytic photometric method for the determination of trace amounts of osmium based on its catalytic effect on the oxidation of chlorophosphonazo-pA by KIO_4 in acid medium is described in this paper. The method offers the advantages of simplicity, rapidity and high sensitivity. Beer′s law is obeyed in a range of 0.02~0.60 mg·L^(-1). The method has been applied to the determination of osmium in precious metals concentates with satisfactory results.

关 键 词：催化光度法 锇 偶氮氯膦-pA 

分 类 号：O657.31[理学—分析化学]