This training material focuses on the principles and implementation of harmonised Quality Assurance and Quality Control (QA/QC) in chemical analysis within the PARC project, particularly under Task 9.3. It presents key aspects such as sampling procedures, method performance criteria, interlaboratory comparability, and data reporting, with practical guidance developed across multiple work packages. Emphasis is placed on aligning QA/QC practices across various chemical and matrix domains to ensure the consistency, reliability, and usability of monitoring data, supported by hands-on exercises and examples.

This work was carried out in the framework of the European Partnership for the Assessment of Risks from Chemicals (PARC) and has received funding from the European Union’s Horizon Europe research and innovation programme under Grant Agreement No 101057014. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the Health and Digital Executive Agency. Neither the European Union nor the granting authority can be held responsible for them.