Critical review of the default values used in the environmental impact assessment of biocidal products applied in livestock production systems

Background: The default values in the models used for environmental risk assessment are mostly more than a decade old. Market developments, structural and legal changes lead to adaptions of animal husbandry and manure management during this time. The scope of this research project was the critical review with regard to the topicality and plausibility of the default values for the assessment of insecticides/larvicides and disinfectants in stables, which are mentioned in the relevant emission scenario documents (Joint Research Centre, Institute for Health and Consumer Protection, Raffael B, Van de Plassche E (2012) Emission scenario document for product type 3: veterinary hygiene biocidal products. Publications Office. 10.2788/29747; OECD (2006) Emission Scenario Document for Product Type 18 No.14 Emission Scenario Document for Insecticides for Stables and Manure Storage Systems”, ENV/JM/MONO(2006)4), supplemented by the draft of Addendum 1 (European Chemicals Acd 1999 agency (ECHA) (draft recommendation of 2021). Addendum to OECD SERIES ON EMISSION SCENARIO DOCUMENTS, Number 14: Emission Scenario Document for Insecticides for Stables and Manure Storage Systems, ENV/JM/MONO(2006)4 Version 1.2). Results: Several default values used in the current emission scenario documents (ESDs) were identified as outdated such as the housing scenarios for laying hens. It should be evaluated if outside climate housing was already covered by the existing scenarios or requires the addition of a new one. Additionally, the lack of valid data regarding for instance biocide application and biodegradation data, may also have an impact on the predicted environmental concentration (PEC). Conclusions: Based on the results of the present study an update of the ESDs is suggested.