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Perchlorate as an environmental contaminant
1United States Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Water Supply and Water Resources Division, 26 West Martin Luther King Drive, Cincinnati, OH 45268, USA. urbansky.edward@epa.gov
Summary
Perchlorate contamination in drinking water, primarily from aerospace activities, poses thyroid risks. Removal methods include anion exchange and filtration, with ongoing research into safe exposure levels.
Area of Science:
- Environmental Science
- Toxicology
- Analytical Chemistry
Background:
- Perchlorate anion (ClO4-) is prevalent in southwestern US drinking water.
- Sources include ammonium perchlorate releases from defense and aerospace industries.
- Perchlorate is a strong oxidant, persistent in the environment, and interferes with thyroid function by mimicking iodide.
Purpose of the Study:
- To review the environmental occurrence of perchlorate.
- To discuss its toxicity, particularly to the thyroid gland.
- To outline analytical methods and remediation strategies for perchlorate.
Main Methods:
- Environmental sampling and analysis using ion chromatography.
- Review of existing literature on perchlorate toxicity and environmental fate.
- Evaluation of remediation techniques such as anion exchange and membrane filtration.
Main Results:
- Perchlorate is widespread in drinking water due to industrial activities.
- It poses a health risk by affecting thyroid function.
- Analytical methods and remediation technologies are available and effective.
Conclusions:
- Perchlorate contamination is a significant environmental and health concern.
- Effective analytical and remediation methods exist for perchlorate.
- Further research is needed to establish safe daily exposure limits.