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Advancing microplastic analysis: Pyrolysis-GC-MS method development and validation for small polymer particles in complex environmental matrices
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Scientists developed a more precise lab method to detect and measure tiny plastic particles (microplastics) hiding in soil and river water, testing it on real samples from grasslands and rivers. They found measurable levels of several plastic types, including PVC and polyethylene, in both environments, a reminder that microplastics are widespread in the ecosystems that produce our food and water. Better detection tools like this one are a key step toward understanding how much plastic pollution we're actually exposed to and what risks it might pose to our health.
A novel Pyrolysis-GC-MS method was developed for the quantification of microplastics in environmental samples, addressing the need for reliable analytical techniques to assess microplastic pollution in terrestrial and freshwater ecosystems. A multi-ion approach using one quantification ion and two confirmation ions for each of 12 common polymers was developed and validated according to the NF T 90-210 standard. Rigorous sampling and pretreatment protocols were implemented. The method was demonstrated to be applicable in quantifying microplastics in soils and river samples. In river water, total microplastic concentrations reached up to 1.4 µg/L, with PVC exhibiting the highest variability and median values among the detected polymers. In grassland soils, a wider diversity of polymers was observed, with PVC and PE being the major contributors and showing substantial spatial variability. These findings indicate that the developed Py-GC-MS method provides a robust and sensitive analytical framework for the identification and quantification of microplastics in complex environmental matrices, supporting advanced environmental monitoring and risk assessment.
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