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《Chinese Journal of Analytieal Chemistry》 1998-03
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Catalytic Spectrophotometric Simultaneous Determination of Trace Vanadium (Ⅴ)and Chromium (Ⅵ)Based on Oxidation of Amaranth by Potassium Chlorate

Zhang Aimei (Department of Chemistry, Liaocheng Teacher's College, Liaocheng 252059)  
A catalytic spectrophotometric method for the simultaneous determination of trace vanadium(Ⅴ) and chromium(Ⅵ) is described. It is based on the catalyzed discoloring reaction of amaranth oxidized by potassium chlorate and citric acid as activator in sulfuric acid medium. The optimum conditions influencing the reaction rate were studied. The linear range of determination is 0-8 ug/L for V(Ⅴ) and 0-0. 6 mg/L for Cr(Ⅵ). The detection limit for V(Ⅴ) is 1.79×10-7 g/L and for Cr(Ⅵ) is 2.36×10-5 g/L. The method is satisfactorily applied to the determination of V(Ⅴ) and Cr(Ⅵ) in nature water, steel and waste wa ter.
【CateGory Index】: O657.3
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