title: Wet deposition flux and runoff output flux of mercury in a typical small agricultural watershed in Three Gorges Reservoir areas.
abstract: In order to explore the contributions of wet deposition and runoff formed by rainfall events to the water body mercury burden in Three Gorges Reservoir (TGR), we conducted a 1-year successive study on the deposition fluxes and runoff output characteristics of total mercury (THg) and methylmercury (TMeHg) in a typical small agricultural watershed in TGR areas. The results showed that the annual volume-weighted concentration (VWC) of THg and TMeHg was 18 and 0.23 ng L(-1), respectively. Particulate form was the main form of both THg and TMeHg, accounting for 61 % of THg and 59 % of TMeHg. The annual deposition fluxes of THg and TMeHg in rainfall were 13 ± 2.4 μg m(-2) year(-1) and 174 ± 52 ng m(-2) year(-1), respectively. The VWCs of THg and TMeHg in runoff were 10 ± 6.5 and 0.15 ± 0.15 ng L(-1). The annual output fluxes of THg and TMeHg to TGR from study area were 1.2 ± 0.73 μg m(-2) year(-1) and 17 ± 16 ng m(-2) year(-1), respectively.
authors.affiliation: College of Resources and Environment, Southwest University, Chongqing, 400715, People's Republic of China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhao
authors.forename: Dingyong
authors.initials: D
authors.lastname: Wang
authors.forename: Ya
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Mu
authors.forename: Jinshan
authors.initials: J
authors.lastname: Zhu
mesh_terms: D000383:Agriculture; D002681:China; D002849:Chromatography, Gas; D002852:Chromatography, Ion Exchange; D004784:Environmental Monitoring / Q000379:methods / Q000706:statistics & numerical data*; D008628:Mercury / Q000032:analysis*; D008767:Methylmercury Compounds / Q000032:analysis*; D011891:Rain; D045483:Rivers / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008767:Methylmercury Compounds; D014874:Water Pollutants, Chemical; D008628:Mercury