PT-WFD The Self-committed Network of PT Providers to Support the Implementation of the Water Framework Directive

Mission of the PT-WFD network

The mission of the PT-WFD network is to provide harmonised proficiency testing (PT) schemes that

• - Meet the specific requirements of the European water framework directive (WFD),
• - Are performed and evaluated in a harmonised and comparable way.

This includes:

• - Harmonized performance evaluation of European labs involved in WFD monitoring analysis,
• - Organisation of Pan-European PTs for analytes that are analysed only by few labs,
• - Economically sound organisation of PT schemes due to synergy effects with other PT providers,
• - Regular scientific input from external advisors,
• - Combined forces on new developments and gaps in the spectrum of needed WFD PT schemes.

with the following features

• Harmonisation and ensuring a high quality of PTs through :
  • - Operation in accordance with ISO/IEC Guide 43 (ISO/IEC 17043),
  • - Evaluation of data according to ISO 13528.
• High quality and fitness of PT samples for WFD
  • - Matrix, typology and concentration level of analytes adapted to WFD requirements.
• Common criteria for :
  • - Definition of assigned values,
  • - Definition of the standard deviation for performance assessment (SDPA),
  • - Assessment of laboratory performance on the basis of z-scores.