Study On The Analysis Of A Variety Of Trace Organic Contaminants In Xiang Jiang River

With the determination and pragmatic advance of Chang-Zhu-Tan two type social experimental area, Changsha industrialization process ushers in a more rapid development. The pollution of natural environment around Xiangjiang River is getting serious resulting in increasingly complex compositions and rising concentrations of organic pollutants in Xiangjiang River. Many organic pollutants have teratogenicity and carcinogenicity which are seriously affecting the drinking water safety of residents in the basin and threatening the ecological environment and human health. Therefore, the study on quick, environmental and simple pretreatment of the samples in Xiangjiang River and the analytical methods of organic pollutants is of great significance.This study adopts the technologies of purge&trap and pretreatment solid phase microextraction combined with the technologies of gas chromatography and gas chromatography with time of flight mass spectrometry detection to research in the analytical methods of organic pollutants such as volatile halogenated hydrocarbons and benzene series, organochlorine pesticide residues and trace polycyclic aromatic hydrocarbons in water. Meanwhile, the factors affecting the results have been optimized and the established methods have been validated methodologically so as to provide a scientific proof for practical application of the methods.The main contents and conclusions are as follows:1) The analytical method using purge&trap and gas chromatography of volatile organic compounds including halogenated hydrocarbons and benzene series in Xiangjiang River has been established and the conditions of purge&trap have been optimized so as to achieve one-time sample injection, one-time qualitative and quantitative analysis of20kinds of volatile halogenated hydrocarbons and benzene series. The addition standard recovery of this method is85.8%-104.8%, the relative standard deviation is2.0%-6.5%, and the lowest detection limit is0.10ug/L-0.50ug/L. The results are satisfactory and the method is simple with high sensitivity, which meet the needs in analysis and detection of volatile halogenated hydrocarbons and benzene series in water.2)18kinds of trace organochlorine pesticides in Xiangjiang River have been analyzed and detected by means of automated solid phase microextraction-gas chromatography and time of flight mass spectrometry. The conditions of automated solid phase microextraction such as extraction method, extraction temperature, extraction time, desorption time and ionic strength have been optimized. The addition standard recovery of this method is80.3%-101.3%, the relative standard deviation is3.1%-9.6%, and the method detection limit is0.01-0.2ug/L. The results are satisfactory and the method is simple with high sensitivity, which meet the requirements in analysis and detection of trace organochlorine pesticide residues in water.3) The analytical method using automated solid phase microextraction-gas and mass chromatography for12kinds of poly cyclic aromatic hydrocarbons inXiangjiang River has been established by means of optimizing the conditions of automated solid phase microextraction (extraction method, extraction temperature, extraction time and ionic strength). The automated SPME device effectively overcomes the disadvantages of manual SPME device such as error prone and inaccurate analytical data obtained. The addition standard recovery of12kinds of polycyclic aromatic hydrocarbons is87.3-%105.1%, the relative standard deviation is3.3%-8.8%, and the method detection limit is5-20ng/L. They are all lower than the level of national method detection limit. The method is simple to operate with less secondary pollution, which meets the needs in analysis and detection of polycyclic aromatic compounds in water.