Catalytic Spectrophotometric Determination of Osmium (Ⅳ) Using Osmium (Ⅳ)-KIO4-Chlorophosphonazo-mA System
- VernacularTitle:偶氮氯膦-mA-锇-高碘酸钾催化光度法测定微量锇
- Author:
Hongping XU
;
Jiang LI
;
Xingguo CHEN
;
Zhide HU
- Publication Type:Journal Article
- From:
Chinese Journal of Analytical Chemistry
2001;29(5):546-548
- CountryChina
- Language:Chinese
-
Abstract:
A catalytic spectrophotometric method for the determination of micro amounts of osmium has been established based on the catalytic action of Os(Ⅳ) on the oxidation fading reaction of chlorophosphonazo-mA with KIO4 in alkaline-medium. The reaction conditions were optimized by orthogonal experimental design. The detection limit for osmium was 2.0 μg/L.Beer＇s law was obeyed in the range from 7.0 to 25.0 μg/L for Os(Ⅳ). The method has been applied to the determination of micro amounts of Os(Ⅳ) in concentrate of noble metals and secondary alloy,both of the relative errors were 0.9%. Recoveries varied from 95.38% to 106.0%.
