title: [Research on evaluation of water quality of Beijing urban stormwater runoff].
abstract: The natural rainwater and stormwater runoff samples from three underlying surfaces (rooftop, campus road and ring road) were sampled and analyzed from July to October, 2010 in Beijing. Eight rainfall events were collected totally and thirteen water quality parameters were measured in each event. Grey relationship analysis and principal component analysis were applied to assess composite water quality and identify the main pollution sources of stormwater runoff. The results show that the composite water quality of ring road runoff is mostly polluted, and then is rooftop runoff, campus road runoff and rainwater, respectively. The composite water quality of ring road runoff is inferior to V class of surface water, while rooftop runoff, campus road runoff and rainwater are in II class of surface water. The mean concentration of TN and NH4(+)-N in rainwater and runoff is 5.49-11.75 mg x L(-1) and 2.90-5.67 mg x L(-1), respectively, indicating that rainwater and runoff are polluted by nitrogen (N). Two potential pollution sources are identified in ring road runoff: (1) P, SS and organic pollutant are possibly related to debris which is from vehicle tyre and material of ring road; (2) N and dissolved metal have relations with automobile exhaust emissions and bulk deposition.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. hpq83@163.com
authors.forename: Pei-Qiang
authors.initials: PQ
authors.lastname: Hou
authors.forename: Yu-Fen
authors.initials: YF
authors.lastname: Ren
authors.forename: Xiao-Ke
authors.initials: XK
authors.lastname: Wang
authors.forename: Zhi-Yun
authors.initials: ZY
authors.lastname: Ouyang
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Zhou
mesh_terms: D002681:China; D002947:Cities; D004784:Environmental Monitoring; D009584:Nitrogen / Q000032:analysis; D000644:Quaternary Ammonium Compounds / Q000032:analysis; D011891:Rain; D014867:Water / Q000032:analysis*; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014876:Water Pollution / Q000517:prevention & control; D060753:Water Quality
chemical_list: D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical; D014867:Water; D009584:Nitrogen