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Widespread natural perchlorate in unsaturated zones of the southwest United States

Environmental Science & Technology

By:
, , ORCID iD , , , , , ORCID iD , ORCID iD , and
https://doi.org/10.1021/es062853i

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Abstract

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.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Widespread natural perchlorate in unsaturated zones of the southwest United States
Series title:
Environmental Science & Technology
DOI:
10.1021/es062853i
Volume:
41
Issue:
13
Year Published:
2007
Language:
English
Publisher:
ACS publications
Contributing office(s):
Nevada Water Science Center
Description:
7 p.
First page:
4522
Last page:
4528
Country:
United States