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Citation: LI Xin, LIU Yue-Yin, JING Xiao-Bing, CHEN Li-Ren. Catalytic Spectrophotometric Determination of Trace Platinum by Pt(Ⅳ)-Chlorophosphonazo-pA-KIO₄ System[J]. Chinese Journal of Applied Chemistry, ;2003, 20(10): 1000-1002. shu

Catalytic Spectrophotometric Determination of Trace Platinum by Pt(Ⅳ)-Chlorophosphonazo-pA-KIO₄ System

LI Xin ^a,b ,
LIU Yue-Yin ^b ,
JING Xiao-Bing ^b ,
CHEN Li-Ren ^a,,

1.
a Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000;
2.
b Department of Chemistry, Gansu United University, Lanzhou

Corresponding author: CHEN Li-Ren,
Received Date: 25 March 2003
Available Online: 15 June 2003
Fund Project: 甘肃省教育厅资助项目(GJ200101016) (GJ200101016)

A catalytic spectrophotometric method based on the catalytic effect of Pt(Ⅳ) on the oxidation of 2-(4-chloroe-2-phosphonophenylazo)-7-(4-acetylphenlazo)-1, 8-dihydroxy-3, 6-naphthalenedisulfonicacid(chlorophosphonazo-pA) with KIO₄ in acidic medium has been proposed for the determination of trace platinum. The reaction is performed directly in an aqueous solution and the optimal conditions are given. The detection limit is 5.0×10^-8 g/mL. The Beer's law is obeyed in the range of 1.5×10^-7~3.0×10^-7 g/mL. The method has been applied to the determination of platinum in Pt-Pd ores with satisfactory results.
- platinum,
- chlorophosphonazo-pA,
- catalytic spectrophotometry
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Catalytic Spectrophotometric Determination of Trace Platinum by Pt(Ⅳ)-Chlorophosphonazo-pA-KIO4 System

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Catalytic Spectrophotometric Determination of Trace Platinum by Pt(Ⅳ)-Chlorophosphonazo-pA-KIO₄ System