Atmosphere

Depending on the chemical and physical properties of an active substance, plant protection products can volatilise into the atmosphere. After the short-range and long-range transport of a substance, dry or wet deposition may occur on non-target areas. We investigate and quantify these processes using two test systems on different scales. In a la­boratory wind channel plant we have the opportunity to employ 14C labelled compounds, enabling us to examine in detail the volatilisation process and any relevant determining factors.
For more complex issues on the subject of the volatilisation-related deposition of plant protection products, we have two field wind tunnels that facilitate practical and systematic investigations, due to reproducible wind speeds and a constant wind direction. After conventional application, the volatilised proportion is quantified by air sampling. In addition, dry deposition on non-target plants and in model waters can be measured and assessed.
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.

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