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Detection levels were then determined for PVC and PS and were found to be below less then 50 μg/L, with repeatable data showing good precision (%RSD less then 20%). Further verification of this new method was achieved by the analysis of a complex sample, sourced from a river. The results were positive for the presence of PS with a semi-quantifiable result of 241.8 μg/L. Therefore PY-GCToF seems to be a fit for purpose method for the identification of MPs and NPs from complex mixtures and matrices which have been deposited on PTFE membran