The EQAT scheme has its origin in the quality management activities of the biology workgroup of the Arbeitsgemeinschaft Trinkwassertalsperren (ATT e.V.) in the 1990s. Since 2002, the proficiency test phytoplankton has been carried out on an international level by the LTV.
65 participants have submitted their analyses. Submission of your analyses is now no longer possible.
We are now working very hard to visualise the preliminary results.
The preliminary analysis confirmed the stability of the natural phytoplankton sample. Neither during the analysis period nor during transport changed the cell and biovolume concentration of the five algentaxa. Moreover, all values were between zu-scores of -2 and +2 of the preliminary results.
As soon as our visualisation work is completed, you will be able to view the preliminary results here. Please use the links below. Please be patient for a little longer! We will inform you by e-mail when the preliminary results are available.
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.
