Ziel
To elucidate the role of natural organic colloidal matter on the transport of pesticides through soil.
The project consists of laboratory and field lysimeter studies.
1. In the laboratory the colloid facilitated leaching of four pesticides will be investigated in soil columns. Likewise the dissolved organic carbon in soil solution will be analysed in relation to macrochemical soil properties.
Conditional association constants for pesticide binding to the bulk soil will be measured, in comparison to the adsorption of pesticides to selected dispersible colloidal fractions. This work will be supplemented by spectroscopic analyses in order to detect specific binding interactions between pesticides and dispersed colloidal fractions.
2. On two field lysimeter sites, pesticide movement will be measured as affected by manuring treatments. Water movement and soil solution composition will be monitored. In selected samples, the dissolved organic carbon will be further characterized by advanced spectroscopic (infrared, electronic spin resonance, and fluorescence) and physical-chemical techniques e.g. differential thermogravimetric analysis.
3. Parameters obtained in the laboratory study will be used in solute transport models, together with the macrochemistry and flow data from the lysimeter studies, to model the colloid content in the soil solution and the pesticide movement, both in solution and adsorbed on organic colloids.
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