Wet deposition flux and runoff output flux of mercury in a typical small agricultural watershed in Three Gorges Reservoir areas
2015
Zhao, Zheng | Wang, Dingyong | Wang, Ya | Mu, Zhijian | Zhu, Jinshan
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⁻¹and 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⁻¹and 17 ± 16 ng m⁻² year⁻¹, respectively.
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