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Gewählte Doctoral Thesis:

Andrea Schuhmann (2021): BEHAVIOUR OF PESTICIDES AND THEIR METABOLITES IN WATER, SOIL AND PLANTS - TRANSPORT PROCESSES INVESTIGATED USING LYSIMETER EXPERIMENTS.
Doctoral Thesis - Institut für Bodenforschung (IBF), BOKU-Universität für Bodenkultur, pp 148. UB BOKU obvsg FullText

Abstract:

Pesticides and their metabolites that show the greatest threats to groundwater were selected for this study. To investigate the environmental fate of bentazone, chloridazon, clothianidin, S-metolachlor and terbuthylazine and their main metabolites N-methyl-bentazone, desphenyl-chloridazon, methyl-desphenyl-chloridazon, metolachlor-ESA, metolachlor-OA, desethyl-terbuthylazine and 2-hydroxy-terbuthylazine different lysimeter experiments with a loamy sandy soil at the research station in Wagna (Styria, Austria) were conducted. The emphasis lies on the degradation in soil at different depths, the uptake from soil into maize and the leaching into groundwater. The QuEChERS method for analysing pesticide residues in soil and maize was adapted and validated. A weighable, monolithic lysimeter and a backfilled, gravitation lysimeter were used. All pesticides were applied on the lysimeter surfaces in form of commercial formulations. Leachate, soil and maize samples were collected and analysed. Data of chloridazon and S-metolachlor as well as their metabolites obtained from the weighable, monolithic lysimeter were used for the PEARL model. The results obtained suggest persistence and high dispersion of chloridazon and S-metolachlor, and especially their metabolites, in leachate and soil. Chloridazon and its metabolite desphenyl-chloridazon were also detected in maize. The present investigations show the importance of analysing both parent compounds and metabolites in a long-term study under field conditions to better understand the transport of pesticides in soil-plant-water systems.

Betreuer: Gerzabek Martin

1. Berater: Haberhauer Georg