Metal azolate framework-66-coated fiber for headspace solid-phase microextraction of polycyclic aromatic hydrocarbons

Area of Science:

• Materials Science
• Analytical Chemistry
• Environmental Science

Background:

• Metal-organic frameworks (MOFs), specifically metal azolate frameworks (MAFs), are recognized for their unique structures and applications in analyzing volatile organic compounds.
• Developing advanced materials for sensitive and efficient detection of environmental pollutants is crucial.

Purpose of the Study:

• To fabricate a novel headspace solid-phase microextraction (SPME) fiber coated with MAF-66.
• To evaluate the performance of the MAF-66 coated SPME fiber for the determination of polycyclic aromatic hydrocarbons (PAHs).
• To optimize experimental parameters for enhanced PAH detection.

Main Methods:

• Fabrication of MAF-66 coated SPME fibers using a layer-by-layer deposition method.
• Optimization of key extraction and desorption parameters (temperature, time, stirring rate, salt concentration).
• Analysis of PAHs using gas chromatography (GC).

Main Results:

• The MAF-66 SPME fiber demonstrated good linearity (0.01-100 μg L⁻¹) and low detection limits (0.1-7.5 ng L⁻¹) for various PAHs.
• High enrichment factors (123-3108) and acceptable relative standard deviations (0.23%-4.2%) were achieved.
• The developed fiber showed excellent durability, with over 270 repetitive uses.

Conclusions:

• The MAF-66 coated SPME fiber is a highly effective and robust material for the sensitive determination of PAHs.
• The method shows significant promise for the analysis of PAHs in complex environmental and food matrices.