Perchlorate contamination in Chile: Legacy, challenges, and potential solutions
- Departamento de Ingeniería Hidráulica y Ambiental, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Macul, Santiago (Chile)
- Department of Civil & Environmental Engineering & Earth Science, University of Notre Dame, 156 Fitzpatrick Hall of Engineering, South Bend, IN 46556 (United States)
Highlights: • Perchlorate occurs naturally at high concentrations in Chile, for millions of years. • Perchlorate contaminates soils, sediments, drinking water and food products. • Trade of contaminated food products and fertilizers may affect countries worldwide. • Atacama Desert can be used as a natural laboratory for bioprospecting new bacteria. • Chile should evaluate population risks and mitigation strategies for perchlorate. This paper reviews the unique situation of perchlorate contamination in Chile, including its sources, presence in environmental media and in the human population, and possible steps to mitigate its health impacts. Perchlorate is a ubiquitous water contaminant that inhibits thyroid function. Standards for drinking water range from 2 to 18 µg L{sup −1} in United States and Europe. A major natural source of perchlorate contamination is Chile saltpeter, found in the Atacama Desert. High concentrations of perchlorate have presumably existed in this region, in soils, sediments, surface waters and groundwaters, for millions of years. As a result of this presence, and the use of Chile saltpeter as a nitrogen fertilizer, perchlorate in Chile has been found at concentrations as high as 1480 µg L{sup −1} in drinking water, 140 µg/kg{sup −1} in fruits, and 30 µg L{sup −1} in wine. Health studies in Chile have shown concentrations of 100 µg L{sup −1} in breast milk and 20 µg L{sup −1} in neonatal serum. It is important to acknowledge perchlorate as a potential health concern in Chile, and assess mitigation strategies. A more thorough survey of perchlorate in Chilean soils, sediments, surface waters, groundwaters, and food products can help better assess the risks and potentially develop standards. Also, perchlorate treatment technologies should be more closely assessed for relevance to Chile. The Atacama Desert is a unique biogeochemical environment, with millions of years of perchlorate exposure, which can be mined for novel perchlorate-reducing microorganisms, potentially leading to new biological treatment processes for perchlorate-containing waters, brines, and fertilizers.
- OSTI ID:
- 23105783
- Journal Information:
- Environmental Research, Vol. 164; Other Information: Copyright (c) 2018 Elsevier Inc. All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0013-9351
- Country of Publication:
- United States
- Language:
- English
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