The final version of the guidance document on aged sorption studies of plant protection products in soil was endorsed at the Standing Committee on Plants, Animals, Food and Feed (SCoPAFF meeting) of 25-26 January 2021.
The final version integrates the revisions suggested by the EFSA PPR panel (EFSA Journal 2015;13(7):4175 and EFSA Journal 2018; 16(8);5382). Additional comments from Member States made at SCoPAFF meetings between May 2019 and January 2021 will be considered in a later revision of the document.
The guidance document was drafted in order to provide a framework on how to conduct and interpret experimental studies aiming to demonstrate an increase in pesticide sorption with time and how to integrate the results in regulatory higher tier risk assessments. This framework was built on the basis of a literature review, experimental work and extensive modelling.
Only aged sorption as investigated in laboratory studies is under the scope of this document. Field studies being much more complex, further development and tests with real world data would be needed.
The guidance document addresses the following topics:
- Modelling of aged sorption and conceptual definition of equilibrium sorption;
- Experiments to derive aged sorption parameters;
- Fitting of kinetic models to data from aged sorption studies;
- Aged sorption in the tiered pesticide leaching assessment;
- Special consideration for metabolite.
This new guidance document will apply from 1 April 2021 (date of dossier submission).
Guidance on how aged sorption studies for pesticides should be conducted, analysed and used in regulatory assessments – SANTE/12586/2020–REV 0 – 26 January 2021
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