Widespread natural perchlorate in unsaturated zones of the southwest United States

被引：131

作者：

Rao, Balaji

Anderson, Todd A.

Orris, Greta J.

Rainwater, Ken A.

Rajagopalan, Srinath

Sandvig, Renee M.

Scanlon, Bridget R.

Stonestrom, David A.

Walvoord, Michelle A.

Jackson, W. Andrew ^{[1
]}

机构：

[1] Texas Tech Univ, Dept Civil & Environm Engn, Lubbock, TX 79409 USA

[2] Texas Tech Univ, Inst Environm & Human Hlth, Lubbock, TX 79409 USA

[3] US Geol Survey, Tucson, AZ 85719 USA

[4] New Mexico Inst Min & Technol, Socorro, NM 87801 USA

[5] Univ Texas, Bur Econ Geol, Austin, TX 78713 USA

[6] US Geol Survey, Menlo Pk, CA 94025 USA

[7] US Geol Survey, Colorado Springs, CO 80225 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2007年 / 41卷 / 13期

关键词：

D O I：

10.1021/es062853i

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A substantial reservoir (up to 1 kg ha(-1)) of natural perchlorate is present in diverse unsaturated zones of the arid and semi-arid southwestern United States. The perchlorate co-occurs with meteoric chloride that has accumulated in these soils throughout the Holocene [0 to 10-15 ka (thousand years ago)] and possibly longer periods. Previously, natural perchlorate widely believed to be limited to the Atacama Desert, now appears widespread in steppe-to-desert ecoregions. The perchlorate reservoir becomes sufficiently large to affect groundwater when recharge from irrigation or climate change flushes accumulated salts from the unsaturated zone. This new source may help explain increasing reports of perchlorate in dry region agricultural products and should be considered when evaluating overall source contributions.

引用

页码：4522 / 4528

页数：7

共 38 条

[31] Field study of spatial variability in unsaturated flow beneath and adjacent to playas [J].