plant material proficiency test

International Plant-analytical Exchange - IPE

Proficiency tests

Participation is open to all laboratories.


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Test programme Plant
Number of rounds 4 per year
Number of samples 4 per round
Sample size 20 g
Origin Natural source

General Information

  • The sample types/matrices are chosen to represent the materials which you normally analyse.
  • The plant samples are dried at max. 70 0C and milled and sieved to <0.5 mm.
  • The homogeneity of each batch of samples is tested on a selection of parameters.
  • The dried plant samples are stored at -20 oC. and are stable over a number of years.
  • You analyze the test materials according to your normal validated methods and procedures for those elements and parameters you are interested in.
  • Your results are processed at WEPAL/QUASIMEME and published every 3 months under confidential code names.
  • The reports contain all data, statistical evaluation including Z-score plots and method information about the method used.
  • Your reports are available within 3 weeks after the submission deadline
  • New determinands can be added on request.

Trace and major elements

Determinand group

  • In organic Chemical Composition (Nutrients, major and trace elments)
  • Real totals (Elements including silicates)
  • Acid extractabel inorganic composition (so-called totals) (Elements excluding silicates)

Click here for more detailed information about the determinand and the scope of accreditation.

Nutritional values

Determinand group

  • Nutritional values

Click here for more detailed information about the determinand and the scope of accreditation.

Other determinations

Determinand group

  • Isotopes

Click here for more detailed information about the determinand and the scope of accreditation.

How to participate

Complete the application form and return it by email.

Fees

Fees depend on your choice of programme and your preferred number of rounds per year.

Web shop

When available, leftover samples, to be used as reference materials, can be ordered in the WEPAL/QUASIMEME webshop. Participants are entitled to a discount.