This procedure has been elaborated by IDAEA-CSIC to provide support for the implementation of the Global Monitoring Plan (GMP) on Persistent Organic Pollutants (POPs) under the Stockholm Convention. The programme includes the participating countries in Africa, Asia, the Pacific, and Latin America and the Caribbean in the projects financed by the Global Environment Facility (GEF). This procedure is part of the activity 1.1 of the SSFA signed in 2023 between UNEP and CSIC. The objective of this procedure is to describe the main steps for analysis of PFAS in pellets´s surfaces samples. Figure 1 show the main structures of the per- and polyfluoroalkyl substances.