Simultaneous determination of persistent and emerging organic pollutants in microplastics

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Polymer Science

Background:

• Microplastics are ubiquitous environmental pollutants found across all ecosystems.
• Microplastics act as vectors for chemical pollutants, adsorbing and transporting them while preventing degradation.
• This poses risks due to pollutant preconcentration and potential transfer to biota.

Purpose of the Study:

• To develop, optimize, and validate a novel analytical methodology for determining organic pollutants in various microplastic matrices.
• To assess the environmental presence and levels of specific pollutants in microplastic samples from a known accumulation hotspot.
• To evaluate the developed method's greenness, practicality, and sustainability.

Main Methods:

• Solvent extraction using an orbital shaker.
• Gas chromatography coupled with mass spectrometry (GC-MS) detection.
• Validation including recovery, precision, matrix effects, and limits of quantification.

Main Results:

• The validated method achieved 76.0–119.0% recovery with <20% relative standard deviation for most pollutants.
• Limits of quantification ranged from 0.5 to 15.0 ng/g, with significant matrix effects observed.
• Analysis of weathered microplastics from Playa Grande revealed quantifiable pollutants (PAHs, PCBs, UV filters) in all samples.

Conclusions:

• The developed GC-MS method is effective for analyzing organic pollutants in diverse microplastic types.
• Weathered microplastics from Playa Grande are contaminated with various organic pollutants at concerning levels.
• These findings underscore the environmental and human health implications of microplastic pollution.