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《Research of Environmental Sciences》 2008-03
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Assessing the Water Quality in the Water Source Area of the Middle Route of the South to North Water Transfer Project(Danjiangkou Reservoir) Using A Water Quality Index Method

LI Si-yue~(1,2),ZHANG Quan-fa~1 1.Center for Watershed Ecology,Wuhan Botanical Garden,the Chinese Academy of Sciences,Wuhan 430074,China2.Graduate School of the Chinese Academy of Sciences,Beijing 100049,China  
Danjiangkou Reservoir is the water source area of the Middle Route of the South to North Water Transfer Project.Thus,its water quality is of great importance.Based on the data from 2005,water qualities parameters were grouped into 3 types,i.e.poisonous metals((ρ(As)),(ρ(Hg)),(ρ(Cd)),(ρ(Cr)),(ρ(Pb)) and (ρ(Se))),easily purified(pH,(ρ(DO)),I_(Mn),(ρ(BOD_5)) and(ρ(NH_3-N))) and others((ρ(DP)),(ρ(DIN)),(ρ(F~-)),(ρ(Cl~-)),(ρ(SO_4~(2-))),(ρ(NO_3~——N)),(ρ(Cu)),(ρ(Zn)),(ρ(Fe)) and(ρ(Mn))).Firstly,water quality index for every single parameter was calculated,then the grouped indexes were calculated for the three types,and finally the integrated water quality index(WQI) was obtained.The results demonstrate: ① heavy metals Hg,Se,Cd and Pb endanger the water quality security in the reservoir area;② the easily purified and other pollutants belong to Level Ⅱ of the national standard for surface waters(WQI20),while nitrogen is seriously endangering water quality security;③ water quality in the dry season is better than that in the wet season;④ water quality in the Hanjiang reservoir is better than that in the Danjiang reservoir,and water quality in the Danjiang reservoir is better than that in the downstream of the Dam.Surface water standard and drinking water standard should be integrated to evaluate poisonous heavy metals in the water source areas.Additionally,preliminary analysis on the source of the pollutants and water quality conservation strategies are discussed.
【Fund】: 中国科学院“百人计划”项目(O629221C01);; 国家“十一五”科技支撑计划项目(2006BAC10B020)
【CateGory Index】: X824
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