Arid
DOI10.1016/j.chemgeo.2013.05.002
Controls on tungsten concentrations in groundwater flow systems: The role of adsorption, aquifer sediment Fe(III) oxide/oxyhydroxide content, and thiotungstate formation
Johannesson, Karen H.1; Dave, Heeral B.2; Mohajerin, T. Jade1; Datta, Saugata3
通讯作者Johannesson, Karen H.
来源期刊CHEMICAL GEOLOGY
ISSN0009-2541
EISSN1872-6836
出版年2013
卷号351页码:76-94
英文摘要

Groundwater samples were collected along flow paths within the Carrizo Sand aquifer (southeastern Texas) and the Aquia aquifer (coastal Maryland) for analysis of dissolved tungsten (W) concentrations, along with the major solutes, pH, and measures of in situ redox conditions [e.g., dissolved Fe(II), Fe(III), and S(-II) concentrations]. In addition, sediment samples were collected from both aquifers to evaluate the solid-phase speciation of W. Tungsten concentrations in the Carrizo Sand aquifer range from 3.64 to 1297 pmol kg(-1) (mean +/- SD = 248 +/- 440 pmol kg(-1)), with the lowest concentrations reported from the recharge area. Tungsten concentrations progressively increase down gradient along the flow path within Carrizo Sand aquifer groundwaters, reaching the highest levels in sulfidic groundwater roughly 50-60 km from the recharge zone. Tungsten is strongly correlated with pH and dissolved sulfide [i.e., S(-II)] concentrations in Carrizo groundwaters (r = 0.78 and 0.95, respectively). In Aquia aquifer groundwaters W concentrations range between 14.3 and 184.4 pmol kg(-1) (mean +/- SD = 63.9 +/- 59 pmol kg(-1)), and exhibit no, or at best, weak relationships with other geochemical parameters measured along the flow path (e.g., r = 0.4 and 0.08 for W vs. pH and S(-II), respectively). The data suggest that the increase in W concentrations in Carrizo groundwaters reflects, in part, pH-related adsorption/desorption, which has been shown to be substantial for groundwaters and lake waters with pH > 8. Owing to the similar chemical properties of W and Mo, which form thiomolybdates in sulfidic waters, the formation of thiotungstate complexes may also be important in the sulfidic waters of the Carrizo aquifer. The substantially lower W concentrations in Aquia aquifer groundwaters reflect the fact that the maximum groundwater pH never exceeds 8.4 (mean +/- SD pH = 7.97 +/- 0.23), dissolved low S(-II) concentrations remain low (mean +/- SD S(-II) = 0.29 +/- 0.16 pmol kg(-1)), and that Aquia aquifer sediments have substantially higher Fe(III) oxide/oxyhydroxide contents compared to the Carrizo Sand aquifer. Our data indicate that pH-related adsorption/desorption reactions and the Fe(III) oxide/oxyhydroxide content of aquifer sediments are key controls affecting W concentrations in oxic, suboxic, and anoxic groundwaters, and, further, that the formation of thiotungstate species may also be important in some anoxic (i.e., sulfidic) waters. (c) 2013 Elsevier B.V. All rights reserved.


英文关键词Tungsten Groundwater Surface complexation Thiotungstate Solution complexation Geochemical modeling
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000322857500007
WOS关键词EARTH-ELEMENT CONCENTRATIONS ; CARRIZO SAND AQUIFER ; SPECTROPHOTOMETRIC DETERMINATION ; SULFATE REDUCTION ; CARSON DESERT ; NOBLE-GASES ; SPECIATION ; MOLYBDENUM ; TEXAS ; BEHAVIOR
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176366
作者单位1.Tulane Univ, Dept Earth & Environm Sci, New Orleans, LA 70118 USA;
2.Univ Texas Arlington, Dept Earth & Environm Sci, Arlington, TX 76019 USA;
3.Kansas State Univ, Dept Geol, Manhattan, KS 66506 USA
推荐引用方式
GB/T 7714
Johannesson, Karen H.,Dave, Heeral B.,Mohajerin, T. Jade,et al. Controls on tungsten concentrations in groundwater flow systems: The role of adsorption, aquifer sediment Fe(III) oxide/oxyhydroxide content, and thiotungstate formation[J],2013,351:76-94.
APA Johannesson, Karen H.,Dave, Heeral B.,Mohajerin, T. Jade,&Datta, Saugata.(2013).Controls on tungsten concentrations in groundwater flow systems: The role of adsorption, aquifer sediment Fe(III) oxide/oxyhydroxide content, and thiotungstate formation.CHEMICAL GEOLOGY,351,76-94.
MLA Johannesson, Karen H.,et al."Controls on tungsten concentrations in groundwater flow systems: The role of adsorption, aquifer sediment Fe(III) oxide/oxyhydroxide content, and thiotungstate formation".CHEMICAL GEOLOGY 351(2013):76-94.
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