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Mobile arsenic distribution and release kinetics in sediment profiles under varying pH conditions
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|Authors:||Chen Xiang; Sun Qin; Ding Shiming; Chen Musong; Fan Xianfang; Zhang Liping; Zhang, Chaosheng|
|Author Affiliations:||Primary: |
Hohai University, College of Environment, Nanjing, China
Chinese Academy of Sciences, Nanjing Institute of Geography and Limnology, Nanjing, China
National University of Ireland, GIS Centre, Ryan Institute and School of Geography and Archaeology, Galway, Ireland
|Volume Title:||Water, Air and Soil Pollution|
|Source:||Water, Air and Soil Pollution, 228(11). Publisher: Springer, Dordrecht, Netherlands. ISSN: 0049-6979|
|Note:||In English. 51 refs.|
|Summary:||The release of arsenic (As) from sediments poses a risk to human health especially at high pH levels. Despite this, the distribution and kinetic response of mobile As remains unclear under varying pH conditions. In this study, a microcosm incubation experiment was performed, using sediment cores in combination with dialysis (Peeper) and thin film diffusive gradients (DGT), to investigate the distributions of mobile As (soluble As in pore water and DGT-labile As) at high vertical resolutions (2-4 mm). Results show that the concentrations of soluble As present in the water column increased 1.5-fold with an increase in pH from 5.4 to 11.2. Both soluble As in pore water and DGT-labile As exhibited stable low-level distributions in the uppermost layer beneath the sediment-water interface, followed by increasing concentration distribution with decreasing layers to middle depths. The mean concentrations of mobile As species increased with increased water pH in both sediment profiles and with upward diffusion gradients, showing a 0.2-fold increase of soluble As in the top 20-mm layer and a 0.6-fold increase in deeper 20-52-mm layers, while DGT-labile As showed a 1.0- and 1.1-fold increase in these two layers, respectively. Modeling of DGT-induced flux in sediments (DIFS) showed that the desorption rate constant increased more rapidly than the absorption rate constant, resulting in the increased availability of solid As pools, therefore resupplying the soluble As in pore water from sediments. Copyright 2017 Springer International Publishing AG, part of Springer Nature and Springer International Publishing AG|
|Subjects:||Arsenic; Cores; Diffusivity; Eh; Experimental studies; Kinetics; Metals; Microorganisms; PH; Pollution; Pore water; Public health; Risk assessment; Sediment-water interface; Sediments; Solubility; Toxic materials|
|Copyright Information:||GeoRef, Copyright 2021 American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany|
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