Chem. J. Chinese Universities ›› 1984, Vol. 5 ›› Issue (6): 791.
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Zhang Fan, Chen Guonan, Yang Yiqiang, Hung Shaopeng
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Abstract: The color reaction of Cr (Ⅱ) -Br-PF-CPBis studied in detail. In the presence of CPB, Cr (Ⅱ) is found to be able to react with Br-PFand form a purple complex in the pHrange of 3.5-5.0 under heating in 50℃ water for 10 min. The molar ratio of the complex is 1:3, its wavelength of maximum absorbance is 586nm.The molar absorptivity is 1.44× 105. Beer's Law is obeyed for 0-2.5μg of Cr(Ⅱ) in 10ml solution. In the presence of CyDTA, the interferences of many ordinary ions are eliminated. Amethod for determining Cr in steel and water is developed. It has been applied to real sample analysis, and good results are obtained.
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Zhang Fan, Chen Guonan, Yang Yiqiang, Hung Shaopeng . A New Sensitive Method for Determination of Chromium (Ⅵ) by Spectrophotometry ——A Study on the Color, System of Cr(Ⅵ)-Br-PF-CPB[J]. Chem. J. Chinese Universities, 1984, 5(6): 791.
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http://www.cjcu.jlu.edu.cn/EN/Y1984/V5/I6/791
