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| Titel |
Sorption of Pesticides to Natural and Synthetic Nanoparticles |
| VerfasserIn |
Leyla Guluzada, Leilei Luo, Martin Pattky, Reiner Anwander, Carolin Huhn, Stefan Haderlein |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250137581
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| Publikation (Nr.) |
 EGU/EGU2017-338.pdf |
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| Zusammenfassung |
| Many organic pollutants tend to associate with particles in environment. Such interactions
with solid surfaces may not only alter the reactivity and bioavailability of pesticides, but
also their uptake. This alteration may occur both in the way and in the amount the
compound enters the organisms. In its turn this may change the overall effects of these
compounds on organisms and ecosystems. The main goal of the work presented here is
to provide mechanistic information on the sorbate-sorbent interactions between
nanoparticles and a set of pesticides under environmentally relevant and physiological
conditions. As such, the work is part of the interdisciplinary graduate research program
EXPAND at the University of Tübingen investigating molecular interactions between
pesticides and particles to elucidate how such interactions impact the toxicological
effects.
To this end, natural and synthetic nanoparticles covering a wide range of physicochemical
properties and pesticides for different target organisms were used. Sorption experiments were
carried out with insecticides (imidacloprid; thiacloprid), fungicides (hexaconazole;
propiconazole) and herbicides (glyphosate with its metabolite AMPA; glufosinate). The
choice of the pesticides was based on their environmental significance and their mode of
action. Both engineered nanoparticles with tailored surface properties and nanoparticles of
natural origin were characterized and applied to cover various modes of sorptive interactions
with the pesticides.
The impact of various geochemical and physiological conditions including pH,
temperature, ionic strength, background electrolytes and DOM (dissolved organic matter) on
the sorption of the pesticides to nanoparticles was studied. Sorption kinetics and sorption
isotherms were determined and the results are discussed in terms of predominant sorption
mechanisms and the suitability of certain nanoparticles for toxicological studies in the
framework of the EXPAND project. |
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