DOI: 10.5194/hess-18-1089-2014
Scopus记录号: 2-s2.0-84897105707
论文题名: Identifying sources and controlling factors of arsenic release in saline groundwater aquifers
作者: Liu C ; -W ; , Lu K ; -L ; , Kao Y ; -H ; , Wang C ; -J ; , Maji S ; -K ; , Lee J ; -F
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 3 起始页码: 1089
结束页码: 1103
语种: 英语
Scopus关键词: Alkalinity
; Aquifers
; Arsenic
; Desorption
; Dissolution
; Groundwater resources
; Hydrogeology
; Sediments
; Controlling factors
; Desorption behavior
; High gradient magnetic separation
; Hydrogeochemical studies
; Numerical results
; Reductive dissolution
; Saline groundwater
; Shallow groundwater
; Hydrochemistry
; aquifer pollution
; arsenic
; bicarbonate
; coastal aquifer
; concentration (composition)
; dissolution
; experimental study
; groundwater pollution
; hydrogeochemistry
; iron oxide
; leaching
; phosphate
; redox conditions
; saline intrusion
英文摘要: An integrated hydrogeochemical study was carried out to realize the occurrence of arsenic (As) in a saline aquifer. Saline groundwater was mostly concentrated in the uppermost aquifer, and non-saline water was in the lower aquifer in the study area. High As concentrations were found in both the uppermost and lower aquifers. No correlation among salinity, well depth and As concentration was observed. Various forms of Fe oxyhydroxides were identified in the magnetic fractions, which were concentrated by high gradient magnetic separation (HGMS) technique, revealing that the redox cycling of Fe occurred in the subsurface. High levels of Fe, HCO3 -, DOC and NH 4 + concentrations accompanying alkaline pH in the As-rich groundwater were consistent with the mechanism triggered by the microbially mediated reductive dissolution of Fe oxyhydroxides. A proposed threshold value of 50μg L-1 As concentration was used as an indicator for identification of active proceeding reductive dissolution of As-bearing Fe oxyhydroxides in the saline aquifer. Desorption behaviors of As were relevant to its valence in the sediments and the co-existence of anions. Experimental and numerical results showed that additions of Cl-and SO4 2-, which represent the main anions of saline water, had minor effect on leaching sedimentary As. Although bicarbonate addition resulted in less As desorption than that of phosphate on a molar basis, the contribution of bicarbonate to the total release of As was greater than phosphate due to the much higher concentration of bicarbonate in shallow groundwater and the associated microbial mediation. Collectively, the chemical effect of saline water on the As release to groundwater is mild in the coastal aquifer. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78294
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, 10617, Taiwan; National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
Recommended Citation:
Liu C,-W,, Lu K,et al. Identifying sources and controlling factors of arsenic release in saline groundwater aquifers[J]. Hydrology and Earth System Sciences,2014-01-01,18(3)