Transport mechanisms of soil-bound mercury in the erosion process during rainfall-runoff events

Zheng, Yi1,2; Luo, Xiaolin2; Zhang, Wei3; Wu, Xin2; Zhang, Juan1; Han, Feng1

2016-08

10.1016/j.envpol.2016.04.101

ENVIRONMENTAL POLLUTION   影响因子和分区

0269-7491

1873-6424

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. (C) 2016 Elsevier Ltd. All rights reserved.

Mercury Soil organic matter Erosion Nonpoint source pollution Enrichment ratio Rainfall runoff

SCI ; EI

英语

第一 ; 通讯

China Geological Survey[12120113015200]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000378961000002

ELSEVIER SCI LTD

20162002381263

Aquatic ecosystems ; Biogeochemistry ; Biological materials ; Erosion ; Mercury (metal) ; Organic carbon ; Rain ; Runoff ; Soils ; Water pollution ; Watersheds

Precipitation:443.3 ; Surface Water:444.1 ; Water Pollution:453 ; Ecology and Ecosystems:454.3 ; Biological Materials and Tissue Engineering:461.2 ; Geochemistry:481.2 ; Soils and Soil Mechanics:483.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

Web of Science

1.South Univ Sci & Technol China, Sch Environm Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
2.Peking Univ, Coll Engn, Beijing 100871, Peoples R China
3.Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China

Zheng, Yi,Luo, Xiaolin,Zhang, Wei,et al. Transport mechanisms of soil-bound mercury in the erosion process during rainfall-runoff events[J]. ENVIRONMENTAL POLLUTION,2016,215:10-17.

Zheng, Yi,Luo, Xiaolin,Zhang, Wei,Wu, Xin,Zhang, Juan,&Han, Feng.(2016).Transport mechanisms of soil-bound mercury in the erosion process during rainfall-runoff events.ENVIRONMENTAL POLLUTION,215,10-17.

Zheng, Yi,et al."Transport mechanisms of soil-bound mercury in the erosion process during rainfall-runoff events".ENVIRONMENTAL POLLUTION 215(2016):10-17.