This document establishes a qualitative-quantitative analytical evaluation (i.e. determination) of microplastics to be able to define their: - particle number; - morphology (morphological characteristics); - dimensional distribution; - the type, chemical origin or nature of polymers and their colour, if present. This document is applicable to the determination of microplastics (from the textile sector) collected in various matrices (for example textile process wastewater, clothes washing water, textile process air emissions, textile process solid waste).