干旱区生态环境知识资源中心(Arid): Role of climate and geography in arsenic mobility and risk at an artisanal mining site in an urbanized semi-arid environment

Arid

DOI	10.1016/j.jenvman.2021.114163
	Role of climate and geography in arsenic mobility and risk at an artisanal mining site in an urbanized semi-arid environment
	Wright, James; Cathcart, Eric; Walther, Suzanne; O'Shea, Bethany
通讯作者	O'Shea, B (corresponding author), Univ San Diego, Environm & Ocean Sci Dept, 5998 Alcala Pk, San Diego, CA 92110 USA.
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2022
卷号	304
英文摘要	Ultra-enriched arsenic (As) concentrations >30% occur at an abandoned artisanal mine in an urban park in San Diego, California, presenting a complex risk to the public. This study uses geochemistry in consideration with climate and geography to evaluate As transport away from the mine. Sediment As concentrations reach 2320 mg/kg (483 times background crustal concentrations; n = 73) along drainage pathways and sequential extraction experiments indicate As overwhelmingly partitions into the least mobile phase (mean 83% As in residual fraction; n = 30); there is little redistribution of As from primary minerals into secondary or dissolved phases - a potentially positive outcome for managing the risk-despite the sediments being exposed to a century of weathering. Dissolved As transport does occur, with intermittent rain events producing As up to 272 mu g/L in runoff. Both sediment and water As decrease to background concentrations within 1,000 m of the mines, influenced by the encroaching urbanization, and the semi-arid climate which limits weathering and transport. Similar patterns of As migration downgradient of abandoned mines occur at other mining sites in arid and semiarid regions; however, off-site As transport at other sites extends far greater distances. This study indicates that a combination of geochemistry, geomorphology, climate, and urbanization can work together to retard the surface transport of As from artisanal and un-remediated mine sites; and helps inform environmental management at this site and others like it.
英文关键词	Arsenic Artisanal mines Semi-arid mining Geochemical transport Legacy contamination Geomorphology
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000733032900006
WOS关键词	SEQUENTIAL EXTRACTION ; SEDIMENTS ; MERCURY ; BIOACCESSIBILITY ; CONTAMINATION ; ARSENOPYRITE ; TECTONICS ; POLLUTION ; SYSTEMS ; NEVADA
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/374554
作者单位	[Wright, James; Cathcart, Eric; Walther, Suzanne; O'Shea, Bethany] Univ San Diego, Environm & Ocean Sci Dept, 5998 Alcala Pk, San Diego, CA 92110 USA
推荐引用方式 GB/T 7714	Wright, James,Cathcart, Eric,Walther, Suzanne,et al. Role of climate and geography in arsenic mobility and risk at an artisanal mining site in an urbanized semi-arid environment[J],2022,304.
APA	Wright, James,Cathcart, Eric,Walther, Suzanne,&O'Shea, Bethany.(2022).Role of climate and geography in arsenic mobility and risk at an artisanal mining site in an urbanized semi-arid environment.JOURNAL OF ENVIRONMENTAL MANAGEMENT,304.
MLA	Wright, James,et al."Role of climate and geography in arsenic mobility and risk at an artisanal mining site in an urbanized semi-arid environment".JOURNAL OF ENVIRONMENTAL MANAGEMENT 304(2022).