Determining pentachlorophenol in body fluids by gas chromatography after acetylation

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Toxicology

Background:

• Pentachlorophenol (PCP) is a widely used pesticide and wood preservative.
• Exposure to PCP can occur through occupational or residential contact.
• Accurate monitoring of PCP levels in biological samples is essential for assessing human exposure and health risks.

Purpose of the Study:

• To develop and validate a sensitive, precise, and accurate method for quantifying pentachlorophenol (PCP) in biological fluids.
• To apply the developed method for assessing PCP exposure in occupationally exposed workers and residents of PCP-treated log houses.
• To investigate the effect of hydrolysis on urinary PCP determination and compare serum and blood PCP levels.

Main Methods:

• Acidification and hexane extraction of body fluids (urine, serum, whole blood).
• Derivatization of PCP with acetic anhydride to form pentachlorophenyl acetate.
• Gas chromatography with an electron capture detector (GC-ECD) for separation and detection.
• Quantitation using the peak height ratio of pentachlorophenyl acetate to an internal standard (tribromophenyl acetate).

Main Results:

• The method demonstrated high sensitivity with a lower detection limit of 1-2 parts per billion (ppb) in urine or serum.
• Application to exposed populations confirmed the method's utility in real-world exposure scenarios.
• Urinary PCP levels increased by approximately 1.8-fold after hydrolysis, indicating the presence of conjugated PCP metabolites.
• Serum PCP concentrations were found to be 2-3 times higher than corresponding whole blood levels.

Conclusions:

• A reliable and rapid analytical method for PCP in body fluids has been established.
• The method is suitable for biomonitoring PCP exposure in various populations.
• Hydrolysis significantly enhances the determination of urinary PCP, and serum provides a higher concentration of PCP compared to whole blood.