Development of a polymeric ionic liquid coating for direct-immersion solid-phase microextraction using polyhedral...

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Perfluorinated compounds (PFCs) are persistent environmental pollutants requiring sensitive detection methods.
• Solid-phase microextraction (SPME) is a versatile technique for sample preparation.
• Developing stable and efficient SPME fibers is crucial for environmental analysis.

Purpose of the Study:

• To develop a novel SPME fiber for the efficient extraction of PFCs from water.
• To chemically bind a crosslinked polymeric ionic liquid (PIL) onto an anodized titanium wire surface.
• To enhance the stability and solvent resistance of the SPME fiber.

Main Methods:

• A novel SPME fiber was fabricated by chemically bonding a crosslinked PIL onto an anodized Ti wire.
• The PIL coating was synthesized using 1-vinyl-3-hexylimidazolium hexafluorophosphate and a POSS cross-linker.
• Extraction of PFCs was performed in direct-immersion mode, followed by HPLC-MS/MS analysis.

Main Results:

• The developed PIL-POSS fiber demonstrated high mechanical stability and enhanced organic solvent resistance.
• Optimized extraction parameters led to good linearity (R<0.998) from 0.1 to 50 ng/mL.
• Method detection limits ranged from 0.005 to 0.08 ng/mL, with good repeatability (<8.6%) and reproducibility (<9.5%).

Conclusions:

• The novel PIL-POSS SPME fiber is a robust and efficient tool for PFC extraction from water.
• The chemical bonding and POSS integration significantly improved fiber performance.
• This method provides a sensitive and reliable approach for monitoring PFCs in environmental samples.