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Quats and glyphosate in flour (P1909-RT)

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Ring test P1909-RT is designed to cover "quats" and glyphosate in flour.

The test material consists of flour (100 g), spiked with

  • chlormequat,
  • difenzoquat,
  • diquat,
  • mepiquat,
  • paraquat, and
  • glyphosate (reporting limit of 0.01 mg/kg required).


The analytical data are assessed with respect to

  • the comparability (z-score), and
  • the trueness (70 to 120% of the spiked level).


Time schedule:

  • Registration is open until:
    15 March 2019
  • Dispatch of samples:
    03 June 2019
  • Deadline for reporting results:
    25 June 2019


Participation fee: 
    750 EUR (parameters: chlormequat, difenzoquat, diquat, mepiquat, paraquat)
 + 100 EUR (optional module: low levels of glyphosate)

The corresponding untreated flour (100g) is available as blank material at a price of
70 EUR (optional).



The test material is shipped by express courier. Shipping costs are included for shipment to EU countries. Additional shipping costs may apply for shipment to Non-EU countries.
Please feel free to contact us to get an individual quote. 

PROOF-ACS reserves the right to cancel ring tests in case of less than ten participants.