2004•Chemical Research and ApplicationRequires access

Spectrophotometric study of the color-fading reaction of chromium (VI) with DBC-arsenazo and its application

Qing-Zhou Zhai

Abstract

In the medium of 0.60 mol/L nitric acid,chromium(Ⅵ)reacts with DBC-arsenazo to produce color-fading reaction.Chromium(Ⅵ) was determined based on this reaction.The aqqarent molar absorptivity of the method is e_(520nm)=2.31×10~5L·mol~(-1)·cm~(-1).Beer's law is obeyed over the range of 1.0-8.0μg/25mL of chromium(Ⅵ).The method was applied to the determination of chromium in the soil samples.

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Key concepts: Chromium, Molar absorptivity, dBc, Nitric acid, Color reaction, Fading, Chemistry, Spectrophotometry