Arid
DOI10.1016/j.apgeochem.2015.08.007
Cr(VI) occurrence and geochemistry in water from public-supply wells in California
Izbicki, John A.1; Wright, Michael T.1; Seymour, Whitney A.1; McCleskey, R. Blaine1; Fram, Miranda S.1; Belitz, Kenneth1; Esser, Bradley K.2
通讯作者Izbicki, John A.
来源期刊APPLIED GEOCHEMISTRY
ISSN0883-2927
出版年2015
卷号63页码:203-217
英文摘要

Hexavalent chromium, Cr(VI), in 918 wells sampled throughout California between 2004 and 2012 by the Groundwater Ambient Monitoring and Assessment-Priority Basin Project (GAMA-PBP) ranged from less than the study reporting limit of 1 microgram per liter (mg/L) to 32 mg/L. Statewide, Cr(VI) was reported in 31 percent of wells and equaled or exceeded the recently established (2014) California Maximum Contaminant Level (MCL) for Cr(VI) of 10 mg/L in 4 percent of wells. Cr(VI) data collected for regulatory purposes overestimated Cr(VI) occurrence compared to spatially-distributed GAMA-PBP data. Ninety percent of chromium was present as Cr(VI), which was detected more frequently and at higher concentrations in alkaline (pH >= 8), oxic water; and more frequently in agricultural and urban land uses compared to native land uses. Chemical, isotopic (tritium and carbon-14), and noble-gas data show high Cr(VI) in water from wells in alluvial aquifers in the southern California deserts result from long groundwater-residence times and geochemical reactions such as silicate weathering that increase pH, while oxic conditions persist. High Cr(VI) in water from wells in alluvial aquifers along the west-side of the Central Valley results from high-chromium in source rock eroded to form those aquifers, and areal recharge processes (including irrigation return) that can mobilize chromium from the unsaturated zone. Cr(VI) co-occurred with oxyanions having similar chemistry, including vanadium, selenium, and uranium. Cr(VI) was positively correlated with nitrate, consistent with increased concentrations in areas of agricultural land use and mobilization of chromium from the unsaturated zone by irrigation return. Published by Elsevier Ltd.


英文关键词Groundwater Chromium Trace elements Drinking water California
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000366219800017
WOS关键词WESTERN MOJAVE DESERT ; IN-GROUND WATER ; HEXAVALENT CHROMIUM ; NOBLE-GASES ; ARTIFICIAL RECHARGE ; SOUTHERN CALIFORNIA ; AQUIFER ; QUALITY ; SOILS ; POPULATION
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/185822
作者单位1.US Geol Survey, Reston, VA 20192 USA;
2.Lawrence Livermore Natl Lab, Livermore, CA USA
推荐引用方式
GB/T 7714
Izbicki, John A.,Wright, Michael T.,Seymour, Whitney A.,et al. Cr(VI) occurrence and geochemistry in water from public-supply wells in California[J]. United States Geological Survey,2015,63:203-217.
APA Izbicki, John A..,Wright, Michael T..,Seymour, Whitney A..,McCleskey, R. Blaine.,Fram, Miranda S..,...&Esser, Bradley K..(2015).Cr(VI) occurrence and geochemistry in water from public-supply wells in California.APPLIED GEOCHEMISTRY,63,203-217.
MLA Izbicki, John A.,et al."Cr(VI) occurrence and geochemistry in water from public-supply wells in California".APPLIED GEOCHEMISTRY 63(2015):203-217.
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