Catalytic Spectropbotometric Determination of Trace Rgodium with Diantipyryl-(p-dimethylamino)-phenylmethane-KIO4 System
- VernacularTitle:二安替比林对二甲氨基苯基甲烷-高碘酸钾催化光度法测定痕量铑
- Author:
Jishu CHEN
;
Zubi LI
;
Qiheng XU
- Publication Type:Journal Article
- From:
Chinese Journal of Analytical Chemistry
2001;29(2):208-211
- CountryChina
- Language:Chinese
-
Abstract:
A kinetic method for the detemination of trace rhodium based on the catalytic effect of Rh on the oxidative color reaction of diantipyry1-(p-dimethylamino)-phenylmethane (DAMAM) with potassium periodate in the H3PO4 medium and ot wateer bath was estabished. The optimum condition and kinetic parameters of this reaction were studied in detail. The linear range of the determination was 0～80μg/L, and the detection limit was 6.20×10-7g/L. The apparent activation energy og catalytic reaction was found to be 89.03kJ/mol, rate constant was 2.51×10-4/s. The system wasstable at least 6h. The method has been applid to determine trace rhodium in some catalyst samples with the relative standard deviation of 2.7%～3.2%(n=6) and recovery of 98.2%～103.2% (n=5).
