title: Transport mechanisms of soil-bound mercury in the erosion process during rainfall-runoff events.
abstract: Soil contamination by mercury (Hg) is a global environmental issue. In watersheds with a significant soil Hg storage, soil erosion during rainfall-runoff events can result in nonpoint source (NPS) Hg pollution and therefore, can extend its environmental risk from soils to aquatic ecosystems. Nonetheless, transport mechanisms of soil-bound Hg in the erosion process have not been explored directly, and how different fractions of soil organic matter (SOM) impact transport is not fully understood. This study investigated transport mechanisms based on rainfall-runoff simulation experiments. The experiments simulated high-intensity and long-duration rainfall conditions, which can produce significant soil erosion and NPS pollution. The enrichment ratio (ER) of total mercury (THg) was the key variable in exploring the mechanisms. The main study findings include the following: First, the ER-sediment flux relationship for Hg depends on soil composition, and no uniform ER-sediment flux function exists for different soils. Second, depending on soil composition, significantly more Hg could be released from a less polluted soil in the early stage of large rainfall events. Third, the heavy fraction of SOM (i.e., the remnant organic matter coating on mineral particles) has a dominant influence on the enrichment behavior and transport mechanisms of Hg, while clay mineral content exhibits a significant, but indirect, influence. The study results imply that it is critical to quantify the SOM composition in addition to total organic carbon (TOC) for different soils in the watershed to adequately model the NPS pollution of Hg and spatially prioritize management actions in a heterogeneous watershed.
authors.affiliation: School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong Province, China; College of Engineering, Peking University, Beijing 100871, China. Electronic address: yizheng@pku.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zheng
authors.affiliation: College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Xiaolin
authors.initials: X
authors.lastname: Luo
authors.affiliation: School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.affiliation: College of Engineering, Peking University, Beijing 100871, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Wu
authors.affiliation: School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong Province, China.
authors.forename: Juan
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong Province, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Han
mesh_terms: D017753:Ecosystem; D004787:Environmental Pollution; D008628:Mercury / Q000737:chemistry*; D008962:Models, Theoretical; D011891:Rain; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D008628:Mercury
keywords: Enrichment ratio; Erosion; Mercury; Nonpoint source pollution; Rainfall runoff; Soil organic matter