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DOI | 10.1016/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
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ISSN | 0883-2927 |
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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