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TIAN Huai-jun, SHU Wei-qun , ZHANG Xue-kui, WANG You-min, CAO Jia (1.Department of Environmental Hygiene, The Key Laboratory of Ecological Environment and Human Heatlth Research in the Three Gorges Region in Chongqing, The Third Military Medical University, Chongqing 400038, China; 2. Chongqing Centers for Diseases Control and Prevention, Chongqing 400042, China; 3. Chongqing Water Supply General Co. Chongqing 400000, China)  
The organic compounds in the Jialing River and the Yangtze River that are the source of drinking water for Chongqing City have not been found previously. The Solid Phase Extraction-GC/MS method was employed in this study. 100 or more organic compounds were identified in source water, 60 in the Jialing River and 50 in the Yangtze River, the most of which are phthalic acid, esters, keton, phenol, benzene and derivatives. The organic contamination character was different in the source water of the Jialing River and the Yangtze River. Organic contamination levels in Jialing River were much higher than in Yangtze River, and in spring were much higher than in summer in Jialing River, and vice verse in the Yangtze River. The compounds of higher rates detected were di-iso-butyl-phthalate( 100%), di-butyl-phthalate(100%),chloro-4-nitro-benzene(60%), 1,1,3,3,3-pentachloropropane (50%), butylated hydroxytoluene (40%). In addition, many metabolites on intermediate of methamidophos pesticide were detected in B water treatment, with the highest concentration of a single being 56.5μg/L.
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