Abstract

Photochemical reactions contribute to abiotic degradation of pesticides and most other organic chemicals in the environment. Since most pesticides belong to the class of ‘semivolatile organic compounds’ (SOC), they not only have to be tested and evaluated with regard to the soil compartment, the main topic of this workshop, but also with regard to the air and water compartments. Photochemical degradation testing is on different levels of development. This level is highest for the gas phase of the atmosphere, lower for surface watrs, cloud droplets and aerosols and lowest for the soil compartment. The main reason for the unsatisfactory status of development in the soil compartment is the inherent difficulty involved in working on non-homogeneous surfaces.

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