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Priegnitz, Jan

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    Pesticide exposure assessment for surface waters in the EU
    (2016) Bach, Martin; Diesner, Mirjam; Großmann, Dietlinde; Müller, Alexander; Priegnitz, Jan
    In 2001, the European Commission introduced a risk assessment project known as FOCUS (FOrum for the Coordination of pesticide fate models and their USe) for the surface water risk assessment of active substances in the European Union. Even for the national authorisation of plant protection products (PPPs), the vast majority of EU member states still refer to the four runoff and six drainage scenarios selected by the FOCUS Surface Water Workgroup. However, our study, as well as the European Food Safety Authority (EFSA), has stated the need for various improvements. Current developments in pesticide exposure assessment mainly relate to two processes. Firstly, predicted environmental concentrations (PECs) of pesticides are calculated by introducing model input variables such as weather conditions, soil properties and substance fate parameters that have a probabilistic nature. Secondly, spatially distributed PECs for soilŃclimate scenarios are derived on the basis of an analysis of geodata. Such approaches facilitate the calculation of a spatiotemporal cumulative distribution function (CDF) of PECs for a given area of interest and are subsequently used to determine an exposure concentration endpoint as a given percentile of the CDF. For national PPP authorisation, we propose that, in the future, exposure endpoints should be determined from the overall known statistical PEC population for an area of interest, and derived for soil and climate conditions specific to the particular member state. © 2016 Society of Chemical Industry
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    Scientific guidance on soil phototransformation products in groundwater - consideration, parameterisation and simulation in the exposure assessment of plant protection products
    (2022) Schneider, Franziska; Janzen, Wolfgang; Jentzsch, Franziska; Egsmose, Mark; Pickl, Christina; Fait, Gabriella; Priegnitz, Jan
    This Guidance Document gives recommendations how to consider transformation products from soilphotolysis (â€Ìphototransformation productsâ€Ì) when modelling the predicted environmental concentrationsin groundwater. It describes possible parameterisations of the photolytic pathway (i.e. the photolytic half-life and the corresponding reference irradiation) in a tiered approach using the FOCUS-PELMO model.Following the recommendations of the EFSA guidance (2014), separate half-lives can be derived for thesurface processes (kfast) and the biodegradation in the soil matrix (kslow) fromfield dissipation studies byusing biphasic models. Fromfield dissipation studies evaluated with biphasic kinetics, the kfastvalue canbe considered representative for the photolytic degradation on soil surface for non-volatile substances.This value should be determined after a time-step normalisation according to irradiance data for thelocation and period of thefield trial, to a reference irradiance of 100 W mâ Ì2. In case irradiance values arenot available in the study, these values can be derived from databases such as AGRI4CAST or NASA,freely available in the Internet. Quelle: Artikel