干旱区生态环境知识资源中心(Arid): Governing Constraints of Chromium(VI) Formation from Chromium(III)-Bearing Minerals in Soils and Sediments

Arid

DOI	10.3390/soilsystems3040074
	Governing Constraints of Chromium(VI) Formation from Chromium(III)-Bearing Minerals in Soils and Sediments
	Hausladen, Debra; Fakhreddine, Sarah; Fendorf, Scott
通讯作者	Hausladen, D
来源期刊	SOIL SYSTEMS
EISSN	2571-8789
出版年	2019
卷号	3 期号:4
英文摘要	The potential for geogenic Cr(VI) contamination is vast, yet it is difficult to predict susceptible environments as groundwater Cr(VI) concentrations vary significantly, even within a given aquifer, due to physical and hydrologic heterogeneity. The physical structure of soils and sediments exerts a dominant control on Cr(VI) production by dictating the separation distance of reactive phases, the diffusion distance from Cr(VI) generation sites to advecting groundwater, and by influencing infiltration rates and porewater velocity. Here, we used a dual-pore domain model to investigate the relative control of these parameters on Cr(VI) production. The reaction distance between Cr(III)-bearing minerals and Mn oxides predominantly controls Cr(VI) export to advecting groundwater, while changes in diffusion distance between sites of Cr(VI) generation and advective flow channels generally have little impact on steady-state Cr(VI) concentrations. Changes in Cr(VI) diffusion distance can, however, increase the time required for groundwater Cr(VI) concentrations to reach a steady-state; thus, under fluctuating hydrologic and biogeochemical conditions, long diffusion distances still have the potential to suppress Cr(VI) supply to advecting water. Furthermore, we show that high porewater flow velocities effectively dilute Cr(VI) diffusing from soil/sediment aggregates, thus minimizing Cr(VI) concentrations relative to lower porewater velocities. The strong control that the physical/hydrologic parameters exert on Cr(VI) production appears to overwhelm the impact of Cr(III)-mineral solubility within soils and sediments.
英文关键词	indigenous contaminants Mn oxides reactive transport modeling dual domain model
类型	Article
语种	英语
开放获取类型	DOAJ Gold
收录类别	ESCI
WOS记录号	WOS:000505592400014
WOS关键词	WESTERN MOJAVE DESERT ; HEXAVALENT CHROMIUM ; NORTHERN CALIFORNIA ; SACRAMENTO VALLEY ; ULTRAMAFIC SOILS ; OXIDATION ; CR(VI) ; GENERATION ; AVAILABILITY ; GEOCHEMISTRY
WOS类目	Soil Science
WOS研究方向	Agriculture
Scopus学科分类	Univ Sherbrooke, Civil & Environm Engn Dept, Sherbrooke, PQ J1K 2R1, Canada.
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/334031
作者单位	[Hausladen, Debra; Fakhreddine, Sarah; Fendorf, Scott] Stanford Univ, Earth Syst Sci Dept, Stanford, CA 94305 USA; [Hausladen, Debra] Univ Sherbrooke, Civil & Environm Engn Dept, Sherbrooke, PQ J1K 2R1, Canada
推荐引用方式 GB/T 7714	Hausladen, Debra,Fakhreddine, Sarah,Fendorf, Scott. Governing Constraints of Chromium(VI) Formation from Chromium(III)-Bearing Minerals in Soils and Sediments[J],2019,3(4).
APA	Hausladen, Debra,Fakhreddine, Sarah,&Fendorf, Scott.(2019).Governing Constraints of Chromium(VI) Formation from Chromium(III)-Bearing Minerals in Soils and Sediments.SOIL SYSTEMS,3(4).
MLA	Hausladen, Debra,et al."Governing Constraints of Chromium(VI) Formation from Chromium(III)-Bearing Minerals in Soils and Sediments".SOIL SYSTEMS 3.4(2019).