Why to take part in a proficiency tests and why participating in our EQAT scheme?

Inter-laboratory comparisons are an essential part of external quality assurance. Laboratories can test and improve their analytical performance. The EU Water Framework Directive sets high standards for the quality of phytoplankton analysis and requires regular participation in proficiency testing. EQAT Phytoplankton organises such ring trials every 2 years, with typically between 60 and 70 participants. The German Accreditation Body, DAkkS (www.dakks.de), accredits EQAT Phytoplankton for phytoplankton analysis according to DIN EN ISO 17025:2018 and as a provider of interlaboratory comparisons according to DIN EN ISO/IEC 17043:2010. With the help of the innovative reference counting chamber developed by EQAT Phytoplankton, systematic errors can be clearly distinguished from errors related to the detection of algae. This is done within the established work processes at the inverted microscope (Utermöhl technique).

The proficiency tests are based on the procedures described in the DIN EN 15204:2006 Guidance standard on the enumeration of phytoplankton using inverted microscopy (Utermöhl technique) and in DIN EN 16695:2015 Water quality - Guidance on the estimation of phytoplankton biovolume.