光谱学与光谱分析 |
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Study on the Energy Transfer Fluorescence Quenching Reaction of Acridine Orange-4-(2-Pyridylazo) Resorcinol-V(Ⅴ)System and Analytical Application |
HOU Ming1,FENG Li-e1,JIANG Zhi-liang1, 2 |
1. Material and Chemistry Department, Guilin University of Technology, Guilin 541004, China 2. Department of Resource and Environmental Science, Guangxi Normal University, Guilin 541004, China |
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Abstract An energy transfer technique for 4-(2-pyridylazo) resorcinol (PAR)-vanadium(Ⅴ)and acridine orange(AO)was studied, and the optimum conditions of energy transfer system were also experimented. It was found that in citrate-Na2HPO4 buffer solution at pH=5.5, energy transfers from AO to vanadium(Ⅴ)-PAR complexes. A new method based on energy transfer fluorescence quenching for the determination of trace vanadium(Ⅴ)with AO-PAR-V(Ⅴ)was established. The equation of linear regression is ΔF=165.4c+2.5, and the determination range of vanadium is 0.012-0.5 μg·mL-1,with detection limit of 0.004 5 μg·mL-1. The correlation coefficient is R=0.998 5, and relative standard deviation is 0.6%. The fluorescence reaction is completed within 15 minutes, and relative fluorescence intensity remains unchanged for 2.5 hours. The influence of foreign ions on the determination of V (0.5 μg· mL-1) was examined, with a related error of 5%. The method has been used in the determination of trace vanadium in biological samples with the relative error of 6.98%, which meets the requirements of trace analysis.
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Received: 2007-09-28
Accepted: 2007-12-28
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Corresponding Authors:
HOU Ming
E-mail: glhou@glite.edu.cn
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