2002•Chinese Journal of Spectroscopy LaboratoryRequires access

Determination of Chromium(VI) in Soil Samples and Chemical Reagent by Tribromoarsenazo Fading Spectrophotometry

Xin Guan

Abstract

In the medium of 0.48mol/L nitric acid, chromium(Ⅵ) reacts with tribromoarsenazo to produce color-fading reaction. Based on this fact, chromium (Ⅵ) was determined. The apparent molar absorptivity is e 516nm=1.04×10 5 L·mol -1·cm -1. The linear relationship is shown over the range of 1.0×10 -4g/L of chromium(Ⅵ). The method was used for the analysis of chromium(Ⅵ) in the soil sample and chemical reagent.

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