| The pre-processing of sample become one of the most important research areas inmodern analytical technology, with the feature of green and harmlessness toenvironment, it attracted much attention recently. In the dissertation, we developmethod for determination of organic pollutant in water by liquid-phase microextractioncombined with gas chromatography-mass spectrometry detector.In the Section 1 of the experimentation, a method for the determination oftriadimefon in water by liquid-phase microextraction and gas chromatography-massspectrometry was established. Toluene was selected as extraction solvent, and theextraction was performed under the condition of toluene volume 2μL, extracting time15 min, stirring rate 300 rpm and solution temperature 45℃with pH＜12. Under theoptimum condition, the concentration factors was 50, linear range was between 10 to150μg/L, the detection limits was 5μg/L and relative standard deviation for matrixspiked sample was 7%～9%.In the Section 2 of the experimentation, a method for the determination of fivenitrobenzenes (nitro-benzene, 1-nitro-toluene, 2-nitro-toluene, 3-nitro-toluene,1-nitro-chlorobenzene) in water by liquid-phase microextraction and gaschromatography-mass spectrometry was established. Toluene was selected asextraction solvent, and the extraction was performed under the condition of toluenevolume 2μL, extracting time 15 min, stirring rate 300 rpm and solution temperature 45℃with pH=5. Under the optimum condition, the concentration factors for variousanalyte ranged form 30 to 38, linear range was between 2 to 200μg/L, the detectionlimits were in the range of 1～2μg/L. The method of extracting operation had beenimproved, and the RSD of result had been improved obviously too and RSD for matrixspiked sample were between 5%～7%.
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