【摘要】 基于盐酸介质中，钼（Ⅵ）催化盐酸联氨还原橙黄Ⅳ的反应，建立了动力学分光光度法测定痕量钼的新方法。本法检出限为３．７×１０^－３μｇ／ｍＬ，测定钼量范围为０．０２５～１．８μｇ／ｍＬ；已将此法用于测定绿豆中的钼及钼酸铅和钼酸钡的溶度积。更多还原

【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/ mL for 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.更多还原