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Determination of total As, Cd, Hg, iAs and extractable Pb in kaolinitic clay

IL category:

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.

  • Registration for NRLs is free of charge.
  • Registration for official feed control laboratories is 300 euros

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.