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.
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Acknowledgments
This study was financially supported by the National Basic Research Program of China (973 Program) (No. 2013CB430004) and National Natural Science Foundation of China (Nos. 41373113, 41173116).
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Total of 5 figures were involved in the supplementary data. There were: monthly and seasonal variation characteristics of precipitation, monthly variation and seasonal variation characteristics of runoff volumes of Sub-1 and Sub-2, percentages of main ions in rainfall, regression analyses of precipitation with concentrations of THg and TMeHg, and monthly variation and seasonal variation characteristics of THg and TMeHg in runoff of the watershed.
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Zhao, Z., Wang, D., Wang, Y. et al. Wet deposition flux and runoff output flux of mercury in a typical small agricultural watershed in Three Gorges Reservoir areas. Environ Sci Pollut Res 22, 5538–5551 (2015). https://doi.org/10.1007/s11356-014-3701-2
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DOI: https://doi.org/10.1007/s11356-014-3701-2