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.
黄 珊，马建强，肖 琦*，董明月，李雪华，罗秋玲 . 油溶性CdSe量子点荧光探针直接检测农药水胺硫磷 [J]. 光谱学与光谱分析, 2013, 33(10): 2853-2857.
HUANG Shan, MA Jian-qiang, XIAO Qi*, DONG Ming-yue, LI Xue-hua, LUO Qiu-ling . Direct Determination of Isocarbophos by Using Oil-Soluble CdSe Quantum Dots as Fluorescence Probe . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33(10): 2853-2857.
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