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《Chinese Journal of Analytieal Chemistry》 1997-08
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Spectrophotometric Determination of Micro Amounts of Platinum With N-m-Methylphenyl-N' - (Sodium p-Aminobenzenesulfonate) Thiourea

Ma Donglan, Ma Kuangbiao, Wang Yu1u, Li Jianping (Department of Chemistry, Henan Normal University, Xinxiang 453002)  
The color reaction of new water soluble color reagent N-m-methylphenyl-N' - (Sodium-p-aminobenzene sulfonate) thiourea (MMPT) with Pt(N ) was studied. The result indicates that in the HAc-NaAc butter solution with pH 3. 7~4. 4, a stable 1: 3 green com- plex of Pt(Ⅳ) with reagent is formed. The apparent molar absorptivity is 8. 58 ×104L. mol1. cm1 at the maximum absorption wavelength 754. 4 nm and Beer's law is obeyed in the range of 0~1. 28 mg/L. The method has high sensitivity and selectivity. Its operation is simple. Also it can be successfully used for the determination of Pt (Ⅳ) in minera1 and catalysts.
【Fund】: 河南省自然科学基金
【CateGory Index】: O657.3
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