Simply Applicable Method for Microplastics Determination in Environmental Samples

Area of Science:

• Environmental Science
• Analytical Chemistry
• Polymer Science

Background:

• Microplastics (MPs) are a growing concern, with extensive research in marine environments but limited studies on soil ecosystems.
• Standardized methods for identifying MPs in environmental samples are lacking, hindering research progress.
• Current techniques like thermal desorption GC-MS and pyrolysis GC-MS have limitations.

Purpose of the Study:

• To propose a simple, widely applicable method for determining common polymer MPs in environmental samples.
• To provide a standardized analytical approach for laboratories with basic equipment.
• To enable the identification of MPs in complex matrices like soil and algae biomass.

Main Methods:

• Headspace-solid phase microextraction followed by gas chromatography-mass spectrometry (GC-MS).
• Identification of compounds formed during a controlled melting process of microplastics (1 mm–5 mm).
• Method adapted for identifying individual polymer types in blends and complex environmental matrices.

Main Results:

• The proposed method successfully determines common polymer microplastics (PET, PS, PVC, PE, PP).
• It is effective for both coarse (1-5 mm) and fine fraction (1 mm-100 μm) microplastics.
• The technique was validated for complex matrices, including soil and algae biomass.

Conclusions:

• Headspace-SPME-GC-MS offers a simple and broadly applicable solution for microplastic determination.
• This method is suitable for widespread use in analytical laboratories globally.
• It facilitates large-scale monitoring of microplastic pollution in diverse environmental compartments.