Fading reaction of 3-nitro fluorophosphonazo with chromium and its application
YU Shan-hui1, SHANG Fang-jian1, PENG Zhi-hua2
1.School of Chemistry and Molecular Engineering,East China University of Science and Technology, Shanghai 200237,China; #br#
2.Academy of Science, China University of Petroleum East China , Qingdao 266580,China
Abstract：The synthesis of new coloring reagent 3-nitro fluorophosphonazo(fluorophosphonazo-mN) as well as its fading reaction with chromium was reported. It was applied to the state analysis of chromium. In nitric acid medium, the fluorophosphonazo-mN could be significantly faded by chromium when the solution was heated in hot water bath at 85 ℃ for 8 min. Moreover, the Beer's law was obeyed for the absorbance difference at 528 nm between reagent blank and fading solution when the concentration of chromium was in range of 0.006-0.2 μg/mL. The apparent molar absorptivity was ε=1.87×105 L·mol-1·cm-1. The detection limit of method was 1.5×10-3 μg/mL. The proposed coloring system was applied to the direct determination of chromium content in sample. Meanwhile, the ammonium persulfate was added to oxidize the Cr to Cr. The total content of chromium was determined, so the difference was the content of Cr. This coloring system was used for the determination of Cr and Cr in mixed standard solutions with different ratios. The found results were consistent with the theoretical values. The proposed method was also applied to the determination of Cr in industrial waste solution from electroplate factory and steel plant. The relative standard deviations (RSD, n=5) were between 2.2% and 3.4%, and the recoveries of standard addition were between 98% and 103%. The found results were consistent with those obtained by the diphenylcarbazide spectrophotometry.
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