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Gewählte Doctoral Thesis:

Gorana Rampazzo Todorovic (2012): Behaviour of glyphosate and AMPA in soils under the influence of different tillage systems and erosion.
Doctoral Thesis - Institut für Bodenforschung (IBF), BOKU-Universität für Bodenkultur, pp 81. UB BOKU obvsg FullText

Data Source: ZID Abstracts

Abstract:: This work aimed to develop a new extraction method for an exact determination of glyphosate and AMPA in different soils, to investigate the time dependent behavior of glyphosate and AMPA in soils and to investigate the influence of soil erosion processes on the dissipation of glyphosate and AMPA in the environment. The novel method is based on an extraction, utilizing Na-tetraborate, an SPE clean-up step, and subsequent LC-MS/MS detection. In the measurement procedure with LC-MS/MS, a negative mode was used and, FMOC derivatized glyphosate and AMPA ions were identified by the precise determination of their ion mass. The LOQ of both substances (13.8-22.7 μg kg-1 for glyphosate (RSD <10%) and 84.0-88.9 μg kg1 (RSD <10%) for AMPA) in all investigated soil samples demonstrates the sensitivity of the method, which enables measurements of both substances in different soil matrixes. The developed method covers matrix effects of the most representative agricultural soils of Austria, but can be applied for glyphosate and AMPA investigations on any kind of mineral soils. The results show that both, the Kirchberg-Cambisol and the Phyra-Stagnosol, with a higher pedogenic iron-oxide content, adsorbed a distinctly higher quantity of glyphosate and AMPA than the Pixendorf–Chernozem which had a distinctly lower iron-oxide content and a Kd-value about 10 times lower than the Kirchberg-Cambisol. Thus, iron-oxides in general seem to be a key parameter for the glyphosate and AMPA adsorption in soils. The rain simulation experiments could clearly show that even a potentially high erodable soil like the Pixendorf-Chernozem is causing only low damages, if adequate protection practices are applied. In contrast a potentially high adsorbing soil like the Kirchberg-Cambisol causes damages through erosion, if it is easily erodible at the time of application.; Betreuer: Blum Winfried E.H.