Controls of Geochemical and Hydrogeochemical Factors on Arsenic Mobility in the Hetao Basin, China.
Autor: | Zhang Z; Tianjin Center, China Geological Survey, Tianjin, 300170, P.R. China., Guo H; School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing, 100083, P.R. China., Han S; Center for Hydrogeology and Environmental Geology, China Geological Survey, Baoding, 071051, Hebei, P.R. China., Gao Z; Center for Hydrogeology and Environmental Geology, China Geological Survey, Baoding, 071051, Hebei, P.R. China.; State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing, 100083, P.R. China., Niu X; Tianjin Center, China Geological Survey, Tianjin, 300170, P.R. China. |
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Jazyk: | angličtina |
Zdroj: | Ground water [Ground Water] 2023 Jan; Vol. 61 (1), pp. 44-55. Date of Electronic Publication: 2022 Aug 08. |
DOI: | 10.1111/gwat.13230 |
Abstrakt: | High arsenic (As) groundwater is frequently found in inland basins, but little is known about As pools in sediments and their influences on aqueous As distributions. The Hetao Basin is a typical inland basin, where groundwater As concentrations generally increase from alluvial fans to flat plain. Two sites are only 1700 m apart, but groundwater As concentrations at the depth range of 15 to 80 m are quite different, ranging from 7.0 to 31.7 μg/L at site B1 and from 5.2 to 99.8 μg/L at site B2. Sediment geochemistry and groundwater hydrochemistry at two sites were characterized. No distinct differences were observed in the bulk geochemistry of sediments. Sequential extractions of 39 sediments were conducted to determine why As was easily released to groundwater at one site and not the other. Results showed that at site B1 most of solid As was associated with amorphous Fe-(oxyhydr)oxides, whereas at site B2 the strong adsorption pool dominated. Furthermore, higher dissolved Fe 2+ and lower ORP in groundwater at site B2 suggested more strongly reducing conditions compared to site B1. High concentrations of NH (© 2022 National Ground Water Association.) |
Databáze: | MEDLINE |
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