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The Joint Research Centre (JRC) is the European Commission's science and knowledge service which employs scientists to carry out research in order to provide independent scientific advice and support to EU policy.
The EURL-HM-21 proficiency test (PT) focuses on the determination of the mass fractions of total arsenic, cadmium, mercury, inorganic arsenic and extractable lead in kaolinitic clay. This PT is organised in support to Directive 2002/32/EC on undesirable substances in animal feed.
The main objective of this exercise is to assess the analytical capabilities of nominated National Reference Laboratories (NRLs) and official feed control laboratories on the above described measurands.
Participation in EURL-HM-21 is mandatory for all NRLs having experience in this kind of analysis.
Test item and analytes
The test item to be analysed is kaolinitic clay. Each participant will receive one jar of the proficiency test item.
The measurands are total As, Cd, Hg, iAs and extractable Pb in kaolinitic clay.
General outline of the exercise
Participants are requested to perform one to three independent analyses using the method of their choice, and to report the mean of their measurement results, its associated expanded measurement uncertainty and coverage factor k.
Detailed instructions will be sent together with the test item.