title: Assessing remobilization characteristics of arsenic (As) in tributary sediment cores in the largest reservoir, China.
abstract: The environmental impact of the Three Gorges Reservoir (TGR) in China has raised widespread concern especially in relation to metal pollution. The diffusive gradient in thin films (DGT) technology was applied to investigate arsenic (As) remobilization in sediment cores collected from the main stream and a tributary in the TGR during July 2015. The results showed that the horizontal and vertical distributions of CDGT-As varied among the four sampling sites. For the same DGT probe, the horizontal distributions of CDGT-As (0-6mm, 6-12mm, 12-18mm) exhibited similarity in the overlying water and different tendencies in the sediment profiles; the vertical variations of CDGT-As showed different mobilization tendencies. Moreover, the mobility patterns of As in the sediment profile showed the diffusion potential of As from the deep sediment to the surface sediment and overlying water were in the order of MX-2< MX-1< CJ < MX-3. In addition, similar distribution characteristics and correlation analysis showed that the mechanisms of As mobility were associated with Fe and Mn. The results also showed that sulphide and As were simultaneous remobilization in the tributary sediment core in the TGR.
authors.affiliation: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
authors.forename: Li
authors.initials: L
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China. Electronic address: gaosky34@hotmail.com.
authors.forename: Bo
authors.initials: B
authors.lastname: Gao
authors.affiliation: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
authors.forename: Dongyu
authors.initials: D
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China; Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
authors.forename: Wenqi
authors.initials: W
authors.lastname: Peng
authors.affiliation: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Lu
authors.affiliation: Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing 100038, China.
authors.forename: Jijun
authors.initials: J
authors.lastname: Gao
mesh_terms: D001151:Arsenic / Q000032:analysis*; D002681:China; D004058:Diffusion; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000032:analysis; D008345:Manganese / Q000032:analysis; D045483:Rivers / Q000737:chemistry*; D013440:Sulfides / Q000032:analysis; D014874:Water Pollutants, Chemical / Q000032:analysis*; D062066:Water Resources
chemical_list: D013440:Sulfides; D014874:Water Pollutants, Chemical; D008345:Manganese; D007501:Iron; D001151:Arsenic
keywords: Arsenic; Diffusive gradients in thin films (DGT); Sediment cores; Three Gorges Reservoir; Tributaries