A sensitive solid-phase microextraction/gas chromatography-based procedure for determining pentachlorophenol in food

Area of Science:

• Analytical Chemistry
• Food Science
• Environmental Science

Background:

• Pentachlorophenol (PCP) is a persistent organic pollutant with potential health risks.
• Accurate and sensitive methods for PCP determination in food matrices are crucial for consumer safety and regulatory compliance.
• Existing methods may face challenges with complex food matrices and require improvements in sensitivity and efficiency.

Purpose of the Study:

• To develop and validate a new analytical method for the determination of pentachlorophenol (PCP) in various food samples.
• To assess the method's performance, including detection limits, recoveries, and applicability to real food matrices.
• To investigate the presence and levels of PCP in selected food products.

Main Methods:

• Development of a method combining capillary gas chromatography (GC) and microwave-induced plasma atomic emission spectrometry (MIP-AED).
• Application of derivatization, followed by headspace solid-phase microextraction (HS-SPME) for analyte extraction and pre-concentration.
• Utilisation of the standard addition method for accurate quantification due to observed matrix effects.

Main Results:

• The developed method achieved low detection limits for PCP, ranging from 0.03 to 6.0 ng g⁻¹, varying by sample type.
• Satisfactory recoveries (81-109%) were obtained from spiked food samples, indicating good accuracy.
• Pentachlorophenol was detected in honey at concentrations between 0.3 and 1.5 ng g⁻¹; other analysed food samples showed no detectable PCP levels.

Conclusions:

• The new GC-MIP-AED method is a sensitive and reliable technique for PCP determination in diverse food matrices.
• The method's ability to handle matrix effects and achieve low detection limits makes it suitable for routine food safety monitoring.
• The findings highlight the importance of continued monitoring for PCP contamination in food products, particularly in honey.