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Acidic herbicides (with hydrolysis) and ethylene oxide in sesame seeds

EPTIS factsheet 981900 | Last revision 2022-11-23 | URL: https://www.eptis.bam.de/pts981900 https://www.eptis.bam.de/pts981900

PT provider
Based in Germany
Language(s) English, German
Remarks Attention: It is essential to apply a hydrolysis step for this ring test. An analysis of the esters and the free acids only results in an underestimation of the spiked levels! The test samples MUST be analysed twice - with and without hydrolysis. The residue definitions of acidic herbicides according to regulation (EC) No. 396/2005 include the esters, salts and conjugates of the acidic herbicides. 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. P2312-RT is designed to cover all aspects of the analysis of acidic herbicides, including the hydrolysis step in accordance with the residue definition. For that purpose the test material is spiked with selection of - conjugates of acidic herbicides, - commercially available esters of acidic herbicides, and - free acids of acidic herbicides. In order to ensure that the results are unambiguously, either the conjugate or the ester or the free acid is spiked for each of the selected herbicide. In case of one of the herbicides, the conjugate, an ester and the free acid is spiked to simulate the residue situation in routine samples. Acidic herbicides within the scope of the test are summarised below (see parameters). The participants are asked to report the results with and without hydrolysis. The results after alkaline hydrolysis (sum of conjugates, esters and free acids) are considered for evaluation of the trueness of results. Furthermore, ethylene oxide is offered as an additional module. The participants are free to choose the additional module or not. The analytical data are assessed with respect to - the identification of the spiked acidic herbicides, - the comparability (z-score), and - the trueness (70 to 120% of the spiked level).
Product groups Food and drink
Testing fields Analytical chemistry
Technical details
Test item Tested property Testing method
Sesame seeds (non-milled) 4-CPA (free acid) -
2,4-D (free acid) -
2,4-DB (free acid) -
2,4-Dichlorprop (free acid) -
2,4,5-T (free acid) -
2,4,5-TP (free acid) -
Clopyralid (free acid) -
Dicamba (free acid) -
Fenoxaprop (free acid) -
Fluazifop (free acid) -
fluroxypyr (free acid) -
Haloxyfop (free acid) -
MCPA (free acid) -
MCPB (free acid) -
Triclopyr (free acid) -
4-CPC sum (after hydrolysis) -
2,4-D sum (after hydrolysis) -
2,4-DB sum (after hydrolysis) -
2,4-Dichlorprop sum (after hydrolysis) -
2,4,5-T sum (after hydrolysis) -
2,4,5-TP sum (after hydrolysis) -
Fenoxyprop sum (after hydrolysis) -
Fluazifop sum (after hydrolysis) -
Fluroxypyr sum (after hydrolysis) -
Haloxyfop sum (after hydrolysis) -
MCPA sum (after hydrolysis) -
MCPB sum (after hydrolysis) -
Triclopyr sum (after hydrolysis) -
Common esters of acidic herbicides mentioned above -
Ethylene oxide as a sum of ethylene oxide and 2-CE -
Ethylene oxide -
2-Chloroethanol -
Aims of the PT scheme
Target group of participants
Linked to specific legislation / standards
Additional, subsidiary aims
Number of participants 10-20
Accredited or otherwise reviewed by a 3rd party
Operation is commissioned / requested by
Fees and frequency
Participation fee 780-1050 €
Regularly operated Yes (2 rounds per year)
Year of first operation 2019
Contact details of the PT provider
Provider Contact person
Gottlieb-Daimler-Str. 1
28237 Bremen

Phone: +49 (0)421 388 928 50
Web: http://www.proof-acs.de http://www.proof-acs.de
Dr. Birgit Schindler
Phone: +49 (0)421 388 928 50
Email: proof@proof-acs.de proof@proof-acs.de
If you find any mistakes please contact the responsible EPTIS coordinator in Germany, Mr Johannes van de Kreeke. Mr Johannes van de Kreeke.
Any questions or problems? Please contact us at eptis@bam.de.
Application version: 1.22