Biomonitoring as a method for assessing exposure to perchlorate.

Area of Science:

• Environmental Health Sciences
• Toxicology
• Analytical Chemistry

Background:

• Widespread perchlorate (ClO(4)(-)) exposure raises health concerns, particularly regarding thyroid function.
• Biomonitoring offers a direct method to quantify human exposure to environmental toxicants like perchlorate.
• Physiologically relevant anions can interfere with iodide uptake by the thyroid.

Purpose of the Study:

• To assess human exposure to perchlorate (ClO(4)(-)) and related anions using biomonitoring.
• To evaluate the utility of biomonitoring for characterizing perchlorate exposure in various populations.
• To explore the relationship between perchlorate exposure and thyroid health.

Main Methods:

• Quantification of perchlorate (ClO(4)(-)), thiocyanate, nitrate, and iodide in diverse human biological matrices.
• Utilizing ion chromatography coupled with electrospray ionization tandem mass spectrometry (IC-ESI-MS/MS).
• Analyzing variability in perchlorate excretion, exposure sources, and infant exposure.

Main Results:

• Biomonitoring methods successfully quantified perchlorate and other anions in urine, milk, serum, blood spots, amniotic fluid, and infant formula.
• Variability in perchlorate excretion was examined, and key exposure sources in adults were identified.
• Perchlorate exposure was estimated in formula-fed infants, providing crucial data for this vulnerable group.

Conclusions:

• Biomonitoring is a powerful tool for accurate individual exposure assessment of perchlorate and related anions.
• These biomonitoring applications enhance our understanding of perchlorate exposure pathways and levels.
• Comparing individual biomarker data with thyroid function data can elucidate potential health impacts of perchlorate exposure.