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《ANALYSIS AND TESTING TECHNOLOGY AND INSTRUMENTS》 2000-02
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Analysis of Trace Oxalic Acid by Catalytic Spectrophotofluorimetry

WU Qun di\+1, LI Ting sheng\+1, ZHONG Fu xin\+2, JIANG Zhi liang\+1 (1. College of Chemistry and Life Science, Guangxi Normal University, Guilin 541004, China; Wuzhou Teachers College of Guangxi, Hezhou 542800, China)  
Under the condition of 0.04 mol/L H\-2SO\-4 medium at 80 ℃ oxalic acid has catalytic effect on the fluorescense quenching reaction of rhodamine B oxidized by K\-2Cr\-2O\-7. Tap water cooling was selected for quenching the reaction. The effect of various factors on catalytic determination of oxalic acid has been studied spectrophotofluorimetrically. Among the media of H\-2SO\-4, HCl and H\-3PO\-4, oxalic acid in H\-2SO\-4 has the most catalytic activity. The value of log(Fb/Fc) is increasing with the increase of the concentration of K\-2Cr\-2O\-7 in the range of 0~1.0×10\+ 3 mol/L. The value of log(Fb/Fc) increases slowly when the concentration of K\-2Cr\-2O\-7 is more than 1.0×10\+ 3 mol/L. A concentration of 1.25×10\+ 3 mol/L K\-2Cr\-2O\-7 was chosen for use. Rhodamine B is the most sensitivity indicator among rhodamine B, rhodamine S and butylrhodamine B. The value of log(Fb/Fc) is maximum when the concentration of rhodamine B is at 4.0×10\+ 6 mol/L. The optimum reaction temperature is at 80 ℃ and the reaction time is 8 minutes. 23 kinds of co existence substances which effect on the catalytic spectrophotofluorimetric determination of 1 μg/mL oxalic acid have been studied. The results show that most common substances do not interfere to the determination. A new catalytic spectrophotfluorimetric method has been descrided for the determination of 0.03~3μg/mL oxalic acid. The method has been applied to the analysis of oxalic acid in urine sample with satisfactory results.
【Fund】: 广西自然科学基金
【CateGory Index】: O657.3
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