Arid
DOI10.1016/j.jhydrol.2009.09.003
Conservative behavior of arsenic and other oxyanion-forming trace elements in an oxic groundwater flow system
Johannesson, Karen H.; Tang, Jianwu
通讯作者Johannesson, Karen H.
来源期刊JOURNAL OF HYDROLOGY
ISSN0022-1694
EISSN1879-2707
出版年2009
卷号378期号:1-2页码:13-28
英文摘要

Groundwater samples were collected along a flow path in a shallow, fractured tuffaceous aquifer from the Oasis Valley-Beatty Wash region of southern Nevada, USA, and analyzed for a number of oxyanion-forming trace elements including arsenic (As), antimony (Sb), selenium (Se), molybdenum (Mo), and tungsten (W). In addition, ancillary geochemical parameters, including pH, major solute compositions, dissolved silica, dissolved oxygen, and iron and manganese concentrations were quantified in the groundwaters. Arsenic concentrations range from similar to 70 nmol/kg up to 316 nmol/kg in groundwaters of the Oasis Valley-Beatty Wash flow system, and generally exhibit increasing concentrations with flow down-gradient along the flow path. Antimony, W, and to a lesser extent, Mo, exhibit similar increasing concentration trends with flow down-gradient in the aquifer, albeit, at lower concentrations levels (e.g., mean +/- SD for Sb, W, and Mo are 2.3 +/- 0.9 nmol/kg, 7.4 +/- 3.7 nmol/kg, and 101 +/- 19 nmol/kg, respectively). Selenium concentration, which range between similar to 4 and 11 nmol/kg, generally decrease in groundwaters with flow down-gradients in the Oasis Valley-Beatty Wash groundwater flow systems. Inverse modeling of groundwater chemistry evolution from the lower reaches of the Oasis Valley flow path using PHREEQC indicate that the groundwater composition is consistent with mixing of nearly equal proportions of groundwater from upper reaches of Oasis Valley and Beatty Wash groundwater, along with dissolution of volcanic glass, potassium feldspar, and gypsum, followed by calcite precipitation, and formation of secondary zeolites (analcime), clay minerals (Ca-montmorillonite), and cristobalite. The geochemical modeling indicates that the concentrations of As and the other oxyanion-forming trace elements are controlled by dissolution of volcanic glass, water-rock interaction with mineralized zones within the aquifer (i.e., sulfide oxidation), desorption from aquifer surface sites, and mixing of Oasis Valley and Beatty Wash groundwaters. (C) 2009 Elsevier B.V. All rights reserved.


英文关键词Arsenic Oxyanion-forming trace elements Aerobic groundwater Nevada Inverse modeling
类型Review
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000271679700002
WOS关键词VALLEY CALDERA COMPLEX ; UPPER FLORIDAN AQUIFER ; SOUTHERN NEVADA ; BANGLADESH GROUNDWATER ; NATURAL-WATERS ; WEST-BENGAL ; MOLYBDENUM ADSORPTION ; TIMBER MOUNTAIN ; DRINKING-WATER ; CLAY-MINERALS
WOS类目Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向Engineering ; Geology ; Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/161650
作者单位Tulane Univ, Dept Earth & Environm Sci, New Orleans, LA 70118 USA
推荐引用方式
GB/T 7714
Johannesson, Karen H.,Tang, Jianwu. Conservative behavior of arsenic and other oxyanion-forming trace elements in an oxic groundwater flow system[J],2009,378(1-2):13-28.
APA Johannesson, Karen H.,&Tang, Jianwu.(2009).Conservative behavior of arsenic and other oxyanion-forming trace elements in an oxic groundwater flow system.JOURNAL OF HYDROLOGY,378(1-2),13-28.
MLA Johannesson, Karen H.,et al."Conservative behavior of arsenic and other oxyanion-forming trace elements in an oxic groundwater flow system".JOURNAL OF HYDROLOGY 378.1-2(2009):13-28.
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