A highly thermal stable solid phase microextraction fiber prepared by an inorganic binder

Area of Science:

• Analytical Chemistry
• Materials Science
• Environmental Science

Background:

• Solid phase microextraction (SPME) is a crucial technique for analyzing environmental pollutants.
• Existing SPME fibers often lack the thermal stability required for high-temperature applications.
• Molybdenum disulfide (MoS2) possesses a layered structure suitable for adsorption but requires effective binding methods.

Purpose of the Study:

• To develop a novel SPME fiber with enhanced thermal stability and adsorption capabilities.
• To utilize MoS2 as the extraction phase material for analyzing polycyclic aromatic hydrocarbons (PAHs).
• To evaluate the performance of the new fiber compared to existing commercial options.

Main Methods:

• A spraying method was employed to adhere MoS2 onto a stainless steel wire using an acid aluminum phosphate binder.
• The prepared MoS2-acid aluminum phosphate SPME fiber was coupled with gas chromatography for analysis.
• Optimization of adsorption and desorption parameters including ionic strength, time, and temperature.

Main Results:

• The MoS2-acid aluminum phosphate fiber exhibited superior thermal stability, operating effectively at 320 °C.
• Achieved method detection limits below 0.1 μg L⁻¹, with excellent linearity (R² ≥ 0.9981) from 0.1-100 μg L⁻¹.
• Demonstrated good repeatability with relative standard deviation (RSD) values of 3.49-5.81% (single-fiber) and 5.32-7.22% (fiber-to-fiber).

Conclusions:

• The developed MoS2-acid aluminum phosphate SPME fiber offers high thermal stability and a long service life.
• This fiber is advantageous for the extraction and detection of low-volatility analytes like benzo(a)pyrene.
• The method provides a robust and efficient tool for practical applications in environmental monitoring.