title: Analysis and assessment of the nutrients, biochemical indexes and heavy metals in the Three Gorges Reservoir, China, from 2008 to 2013.
abstract: The Three Gorges Reservoir, the world's largest hydropower project, has operated stably for more than five years. To understand its water quality status, the nutrient and biochemical indexes, the total nitrogen (TN), the total phosphorus (TP), the potassium permanganate index (CODMn), the five-day biochemical oxygen demand (BOD5) and fecal coliform (F. coli), as well as the heavy metals (Cu, Hg, As, Cd, Zn and Pb) of samples collected from 10 sites during the time period of 2008-2013 were studied via using multiple analysis approaches. For each parameter, pictures of the spatial and temporal distributions were presented, and the reasons behind their variation trends were elaborated. Principal component analysis (PCA) was applied to identify the types of pollution. The Canadian Council of Ministers of the Environment Water Quality Index (CCME-WQI) was calculated to concisely mark the water quality. In addition, a human health risk assessment of the heavy metals in a representative site was conducted. The results showed that the water quality state in the Three Gorges Reservoir was intricate but stable and acceptable from 2008 to 2013. The TN, TP and Pb were considered to be the key pollution indexes. Enforcements to alleviate industrial and urban pollution, along with ship management, have worked. The decrease in heavy metal concentrations from upstream to downstream was associated with the self-purification of the reservoir. However, rural pollution became worse in those years. Improper agricultural activity was an important reason for this trend. For local residents, drinking water was generally safe, but cancer caused by As and Pb is a potential issue.
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing 210098, People's Republic of China; Research Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Huangpu Road No. 23, Wuhan, 430010, People's Republic of China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Key Laboratory of Integrated Regulation and Resource Development of Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Xikang Road #1, Nanjing 210098, People's Republic of China. Electronic address: envly@hhu.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Clinical Laboratory Medicine & Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China. Electronic address: 791430418@qq.com.
authors.forename: Qingyuan
authors.initials: Q
authors.lastname: Cheng
authors.affiliation: Department of Clinical Laboratory Medicine & Center for Gene Diagnosis, Zhongnan Hospital of Wuhan University, Wuhan, Hubei Province, People's Republic of China.
authors.forename: Mingxia
authors.initials: M
authors.lastname: Yu
authors.affiliation: Research Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Huangpu Road No. 23, Wuhan, 430010, People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Hu
authors.affiliation: Research Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Huangpu Road No. 23, Wuhan, 430010, People's Republic of China.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Research Department of Soil and Water Conservation, Changjiang River Scientific Research Institute, Huangpu Road No. 23, Wuhan, 430010, People's Republic of China.
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Yu
mesh_terms: D057919:Biological Oxygen Demand Analysis; D063646:Carcinogenesis / Q000473:pathology; D002681:China; D005843:Geography; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis* / Q000633:toxicity; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D025341:Principal Component Analysis; D011634:Public Health; D018570:Risk Assessment; D012621:Seasons; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000633:toxicity; D014876:Water Pollution / Q000032:analysis; D060753:Water Quality; D014881:Water Supply
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen
keywords: Multivariate analysis method; Risk assessment; Spatial pattern; Temporal variation; Water quality index