The vertical displacement of agricultural chemicals in soils is a key process in the assessment of the potential endangering of ground water by plant protection products. Starting from baseline studies such as batch adsorption experiments in accordance with OECD 106, we also investigate transport behaviour in microlysimeters with undisturbed soil cores on a laboratory scale.
The sorption parameters generated by this test system are considerably more realistic than batch experiments. Use of 14C labelled compounds enables references to relevant metabolites with leaching tendencies to be obtained at an early stage.
On an even higher scale, field lysimeters with undisturbed soil cores are approached. In accordance with good laboratory practice, radioactively labelled plant protection products are applied to the respective crops and the leaching behaviour of the active ingredient and its metabolites are investigated. Besides the application of low-growing crops, the application of tall-growing crops such as grapevines and fruit trees is also possible in our lysimeter plant.
We perform fate and exposure studies under good laboratory practice based on the relevant guidelines, as well as modelling for authorisations in accordance with EU Directive 91/414/EEC and national legislation. The development and application of higher tier test systems also forms a focal area of our research activity. Risk assessment on the basis of conservative baseline studies can therefore be expanded by a more realistic component.