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Status of Water Quality in the Three Gorges after the Water Storage Period

LV Yi-bing,GONG Zheng-yu,LIAN Jun,WANG Qiang,XING He,LI Guo-gang China National Environmental Monitoring Center,Beijing 100029,China  
The water pollution status was monitored and analyzed for the Three Gorges reservoir area after the second stage of water storage in May,June and October,2003.The results showed that the overall water quality in the reservoir area was mainly at Grade Ⅲ of Water Quality Standard for Surface Water Environment(GB3838-2002).With consideration of the index of fecal coliform bacteria,the water quality belonged to Grade Ⅳ or sub-Ⅴ as a whole.The concentration of the heavy metals met the water quality standard of Grade Ⅰ of Water Quality Standard for Fisheries(GB11607-89) and GB3838-2002 except that the lead concentration was high at all the monitoring sections and the mercury exceeded Grade Ⅲ of GB3838-2002 for 2 times of sampling.19 kinds of volatile organic compounds(VOCs) were detected within which the 1,2-dichloroethane,1,1,2-trichloroethane,1,4-dichlorobenzene,1,2-dichlorobenzene and hexachlorobutadiene belonged to the controlled standard items of Environmental Quality Standard for Surface Water(GB3838-2002).The detected value of these chemicals did not exceed the standard,and the VOCs were mainly halogenated hydrocarbons with less benzene series compounds.The VOCs pollution was slightly compared with other domestic rivers during the period.
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