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

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Texas Tech University, Lubbock Texas,79410, U.S. Geological Survey, Reston, Virginia 20192, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, Shaw Environmental Inc., Lawrenceville, New Jersey 08648, and University of Illinois at Chicago, Chicago, Illinois 60607
* Corresponding author phone: 806-742-3523; e-mail: [email protected]; fax 806-742-3449.
†Texas Tech University.
‡U.S. Geological Survey.
§Oak Ridge National Laboratory.
∥Shaw Environmental Inc.
⊥University of Illinois at Chicago.
Cite this: Environ. Sci. Technol. 2010, 44, 13, 4869–4876
Publication Date (Web):June 3, 2010
Copyright © 2010 American Chemical Society

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    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 indigenous to the southwestern U.S. Stable isotope ratios were measured in ClO418O, Δ17O, δ37Cl) and associated NO318O, Δ17O, δ15N) in groundwater from the southern High Plains (SHP) of Texas and New Mexico and the Middle Rio Grande Basin (MRGB) in New Mexico, from unsaturated subsoil in the SHP, and from NO3-rich surface caliche deposits near Death Valley, California. The data indicate natural ClO4 in the southwestern U.S. has a wide range of isotopic compositions that are distinct from those reported previously for natural ClO4 from the Atacama Desert of Chile as well as all known synthetic ClO4. ClO4 in Death Valley caliche has a range of high Δ17O values (+8.6 to +18.4 ‰), overlapping and extending the Atacama range, indicating at least partial atmospheric formation via reaction with ozone (O3). However, the Death Valley δ37Cl values (−3.1 to −0.8 ‰) and δ18O values (+2.9 to +26.1‰) are higher than those of Atacama ClO4. In contrast, ClO4 from western Texas and New Mexico has much lower Δ17O (+0.3 to +1.3‰), with relatively high δ37Cl (+3.4 to +5.1 ‰) and δ18O (+0.5 to +4.8 ‰), indicating either that this material was not primarily generated with O3 as a reactant or that the ClO4 was affected by postdepositional O isotope exchange. High Δ17O values in ClO4 (Atacama and Death Valley) are associated with high Δ17O values in NO3, indicating that both compounds preserve characteristics of O3-related atmospheric production in hyper-arid settings, whereas both compounds have low Δ17O values in less arid settings. Although Δ17O variations in terrestrial NO3 can be attributed to mixing of atmospheric (high Δ17O) and biogenic (low Δ17O) NO3, variations in Δ17O of terrestrial ClO4 are not readily explained in the same way. This study provides important new constraints for identifying natural sources of ClO4 in different environments by multicomponent isotopic characteristics, while presenting the possibilities of divergent ClO4 formation mechanisms and(or) ClO4 isotopic exchange in biologically active environments.

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    Additional notes on analytical methods and samples, a table of chemical and isotopic data for groundwater samples, a figure showing the SHP-V subsoil salt profile, and a figure comparing molar ratios of Cl/ClO4 and NO3/ClO4 in various settings, are provided. This material is available free of charge via the Internet at

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