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PHASE II: IDENTIFICATION AND CHARACTERIZATION OF NATURAL SOURCES OF PERCHLORATE
Hatzinger, P.B., G. Harvey, W.A. Jackson, J.K. Boehlke, N.C. Sturchio, B. Gu, D. Grantz, K. Burkey, and M. McGrath.
SERDP Project ER-1435, 362 pp, 2017
The project goal was to develop an improved understanding of (1) the distribution and isotopic characteristics of natural perchlorate worldwide, (2) the mechanisms of natural perchlorate production, and (3) the contributing processes resulting in the ubiquitous distribution of this anion and its stable isotope characteristics in soils, groundwater, and vegetation. Distribution of natural perchlorate in soils and groundwater in arid and semi-arid environments was observed worldwide. Natural perchlorate was also found to be the dominant source of this anion in the U.S. Great Lakes at concentrations ranging from 0.05-0.13 µg/L. UV-photolysis and ozone mediated mechanisms both may contribute to the formation of natural perchlorate and to its isotopic characteristics. Biological synthesis of perchlorate in bacteria or plants was not observed, although many plant species were seen to bioaccumulate perchlorate, particularly in leaf tissue. The isotopic signature of the plant-accumulated perchorate represented that of the dominant environmental source, potentially providing a means to identify sources in produce. https://www.estcp.com/content/download/41722/397674/file/ER-1435%20Final%20Report.pdf
SERDP Project ER-1435, 362 pp, 2017
The project goal was to develop an improved understanding of (1) the distribution and isotopic characteristics of natural perchlorate worldwide, (2) the mechanisms of natural perchlorate production, and (3) the contributing processes resulting in the ubiquitous distribution of this anion and its stable isotope characteristics in soils, groundwater, and vegetation. Distribution of natural perchlorate in soils and groundwater in arid and semi-arid environments was observed worldwide. Natural perchlorate was also found to be the dominant source of this anion in the U.S. Great Lakes at concentrations ranging from 0.05-0.13 µg/L. UV-photolysis and ozone mediated mechanisms both may contribute to the formation of natural perchlorate and to its isotopic characteristics. Biological synthesis of perchlorate in bacteria or plants was not observed, although many plant species were seen to bioaccumulate perchlorate, particularly in leaf tissue. The isotopic signature of the plant-accumulated perchorate represented that of the dominant environmental source, potentially providing a means to identify sources in produce. https://www.estcp.com/content/download/41722/397674/file/ER-1435%20Final
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