Analytical Sciences

Estimation of Cr(III) in Water with the Presence of Cr(VI) by Chlorophosphonazo I Color Reaction Spectrophotometry

Huanhuan ZHANG*,** and Wenbiao WU*

*College of Food Science, Southwest University, 216 Tian Sheng Qiao, Chongqing 400715, P. R. China
**Chongqing Academy of Agricultural Sciences, Nongke Avenue, Bai Shiyi, Jiu Longpo District, Chongqing, P. R. China

A method capable of accurately and selectively measuring Cr³⁺ in water is required and was therefore studied. The precision and reproducibility of chlorophosphonazo I color reaction spectrophotometry (CCRS) for the selective determination of Cr³⁺ was improved to be acceptable standards. The CCRS established is therefore an accurate, reproducible and inexpensive method. It also has reasonably good sensitivity and selectivity, and a high sample output. This method should be readily adapted for the routine and selective determination of Cr³⁺ in bottled mineral drinking water with (or without) the supplementation of Cr³⁺ or in natural water such as mineral or pipe water with the presence of Cr⁶⁺.

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