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Acidic herbicides incl. hydrolysis (P1804-MRT)

The residue definitions of acidic herbicides according to regulation (EC) No. 396/2005 include the esters, salts and conjugates of the respective herbicide. The conjugates can contribute significantly to the total amount of the respective herbicides determined in routine samples. An alkaline hydrolysis step is applied to quantify residues of the conjugates in routine samples.

Up to now, the hydrolysis has not been included in proficiency tests. P1804-MRT is designed to meet the analysis of acidic herbicides in accordance with the residue definition and thus including the hydrolysis. 

The test material consists of a homogenate (100 g) of vegetables or fruits (to be defined), which is spiked with a selection of free acids, esters and conjugates of acidic herbicides.

Expected time schedule

  • Registration:
    still open
  • Dispatch of samples:
    (March 5, 2018) postphoned to the second half of 2018
  • Deadline for reporting results:
    (March 22, 2018) postphoned to the second half of 2018

We are currently facing some difficulties related to the preparation of the analytical standards of the conjugates. As a consequence, there will be a delay in the shipment of the test material. 


The analytical data are assessed with respect to

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


The participation fee is 750 EUR. The corresponding blank material is available at a price of 70 EUR.

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 place your orders via the Order/login section on the website.

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