锇-氯化亚锡-孔雀绿高灵敏离子缔合显色反应的研究与应用

HIGHLY SENSITIVE COLOUR REACTION OF ION ASSOCIATE IN THE SYSTEM OF OSMIUM-TIN(Ⅱ)CHLORIDE-MALACHITE GREEN

本文研究了锇-氯化亚锡-孔雀绿体系高灵敏测定锇的光度法。在0.3～0.5mol/l HCl介质中,在聚乙烯醇存在下,锇与三氯锡酸根和氯离子的配合阳离子与孔雀绿阴离子可形成可溶性的显色离子缔合物。该缔合物的最大吸收光谱,λ_(max)=690nm,ε_(690)=1.6×10~6L.mol^(-1).cm^(-1),锇量在0—4μg/25ml符合比尔定律。研究了缔合物的组成,共存离子的影响。通过蒸馏分离,方法已成功的应用于冶金物料中锇的分析,测定的相对标准偏差<10％。

A highly sensitive spectrophotometry for the determination of osmium has been developed. In a medium of 0.3—0.5mol/L HCl and in the presence of PVA, osmium forms asolubilization ion associate with SnCl_2 and malachite green. The molar absorptivity is 1.6×10~6L·mol^(-1)·cm^(-1) at 690nm. Beer's law is obeyed for 0—4μg/25ml of osmium. The composition of the system has been studied. The method has been applied to the determination of osmium in some precious metal samples.