Study Of Determination For Polycyclic Aromatic Hydrocarbons And Metalaxyl In Environmental Sample

Because in the environment sample many pollutant's content are very low, in a trace amount even lower level, therefore, during the determination of the pullutants in environmetal saples, the sample pretreatment technologys are very improtant.. Polycyclic aromatic hydrocarbons, a class of hydrocarbons, have been proven to have carcinogenicity-mutagenicity-teratogenicity, and widely distributed in the environment. PAHs are the environment priority pollutants. The pesticide residue is also one important sources of pollution. in water environment. This article takes PAHs and metalaxyl pesticide residues as the research object, using solid phase extraction and liquid phase microextraction and matrix solid-phase dispersion extraction analysis different environment samples. This article mainly includes three aspect contents:A method for the determination of 16 PAHs in water by SPE-HPLC was established, and studied and optimized systematically the chromatograph conditions and the solid phase extract conditions. Changing the wave length procedure of the variable wavelength detector can eliminate the interference and improve the accuracy of qualitative and quantitative analysis. The detection limit and relative standard deviation were: 0.01～1.05ng/L, 1.1%～8.7%. The recoveries of 16 PAHs in some actual water samples were: 74.6%～128%.Two method for the determinnation of PAHs in oils were established, and studied the conditions of improved SPE and MSPD. In the optimal sample pretreatment and chromatographic conditions, the recoveries and relative standard deviation were: 81%～102%, 3.1%～3.8%. The detection limit may reachμg/Kg level.This article has been developed a method for determination of metalaxyl in water by liquid-phase microextraction coupled with high performance liquid chromatography. Extraction solvent, solvent volume, extraction time, stirring rates, and solution salinity were optimized, and the variable experimental conditions for the liquid phase microextraction process were optimized. The detection limit, relative standard deviation and concentration factor for determination of metalaxyl were 0.86μg/L, 3.8～5.4% and 60.3, respectively. The recoveries of metalaxyl in the standard solution and water samples were 95.0～99.2% and 93.8～99.6%.