| 光谱学与光谱分析 |
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| Direct Determination of Isocarbophos by Using Oil-Soluble CdSe Quantum Dots as Fluorescence Probe |
| HUANG Shan, MA Jian-qiang, XIAO Qi*, DONG Ming-yue, LI Xue-hua, LUO Qiu-ling |
| College of Chemistry and Life Science, Guangxi Teachers Education University, Nanning 530001, China |
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Abstract A simple, rapid and direct approach to isocarbophos determination was developed based on the fluorescence quenching of oil-soluble CdSe quantum dots by isocarbophos. Under the optimized conditions, the linear range of oil-soluble CdSe QDs fluorescence intensity versus the concentration of isocarbophos was 2.30×10-7～1.09×10-5 mol·L-1, with a correlation coefficient of 0.999 9 and a limit of detection of 1.1×10-7 mol·L-1. The proposed method has been applied to the determination of isocarbophos in rice and wheat flour with standard recoveries of 93.3%～105.0%. The fluorescence quenching mechanism was further investigated by using UV-Vis absorption spectra and time-resolved fluorescence spectrum. The results indicated that the fluorescence quenching of oil-soluble CdSe QDs by isocarbophos was caused by the change of the surface state which resulted in the enhancement of the surface defect and the occurrence of the non-radiational recombination.
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Received: 2013-01-13
Accepted: 2013-03-20
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Corresponding Authors:
XIAO Qi
E-mail: qi.xiao@whu.edu.cn
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