Isotopic Composition and Origin of Indigenous Natural Perchlorate and Co-Occurring Nitrate in the Southwestern United States

Perchlorate (ClO4 −) has been detected widely in groundwater and soils of the southwestern United States. Much of this ClO4 − appears to be natural, and it may have accumulated largely through wet and dry atmospheric deposition. This study evaluates the isotopic composition of natural ClO4 − indigen...

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