Catalytic Spectrophotometric Determination of Trace Molybdenum──A New Molybdenum(Ⅵ)-Diamine Hydrochloride Orange Ⅳ Catalytic Spectrophotometric System

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (1): 23.

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Catalytic Spectrophotometric Determination of Trace Molybdenum──A New Molybdenum(Ⅵ)-Diamine Hydrochloride Orange Ⅳ Catalytic Spectrophotometric System

ZHENG Zhao-Sheng, WU He-Zhou, CHEN Zhi-Gui, HUANG Tian-Dong

De partment of Chemistry, Fuzhou University, Fuzhou, 350002

Received:1993-02-10 Revised:1993-06-20 Online:1994-01-24 Published:1994-01-24

Abstract

Abstract: A new catalytic spectrophotometric method for the determination of trace amount of Mo(Ⅵ) has been developed.The method is based on the catalytic effect of Mo(Ⅵ) on the reduction of orange Ⅳ with diamine hydrochloride. The effects of the solution PH,the reagent concentration and interfering ions on reaction rate have been studied.At.different temperatures,the linear range of determination is 0.025-1.8 μg/ mLfor molybdenum.The detection limit is 3.7×10^-3 μg/mL,the relative standard deviation is 2.6%.The apparent activation energy of catalytic reaction is 46.0kJ/ mol.The method has been used to determine trace molybdenum in bean samples and the solubility product of both lead molybdate and barium molybdate.

Key words: Catalytic spectrophotometry, Orange Ⅳ, Molybdenum

TrendMD:

ZHENG Zhao-Sheng, WU He-Zhou, CHEN Zhi-Gui, HUANG Tian-Dong. Catalytic Spectrophotometric Determination of Trace Molybdenum──A New Molybdenum(Ⅵ)-Diamine Hydrochloride Orange Ⅳ Catalytic Spectrophotometric System[J]. Chem. J. Chinese Universities, 1994, 15(1): 23.

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Catalytic Spectrophotometric Determination of Trace Molybdenum──A New Molybdenum(Ⅵ)-Diamine Hydrochloride Orange Ⅳ Catalytic Spectrophotometric System

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