WEPAL-QUASIMEME catalogue 2023

January 23, 2023

The 2023 catalogue for the environmental chemistry proficiency tests organised by WEPAL-QUASIMEME is out. This year, the catalogue covers all QUASIMEME-programmes of contaminants in marine matrices, supplemented with information about the WEPAL-programmes in soil, plants, freshwater sediments, manure & compost and biomass. New in 2023 are the freshwater and wastewater programmes.

The proficiency tests in the freshwater and wastewater programme are a continuation of the proficiency tests previously organised by Rijkswaterstaat (RWS-CIV) in the Netherlands. Rijkswaterstaat is the implementing agency of the Dutch Ministry of Infrastructure and Water Management and has organised proficiency tests in freshwater and wastewater until 2022 to support Dutch and Belgian laboratories involved in national monitoring. WEPAL-QUASIMEME was already the supplier of the test materials used in these proficiency tests. From 2023, WEPAL-QUASIMEME will offer the full organisation of these proficiency tests and will offer five new proficiency tests for freshwater and wastewater.

Participation is open to all laboratories worldwide, however, some determinands are only suitable for local laboratories as analysis needs to be performed on fresh samples. Preservation of samples is not applicable for all types of determinands. A request to participate can be made by sending an e-mail to

WEPAL-QUASIMEME catalogue 2023