The influence of agricultural pesticides on the stability of emerging contaminants including engineered nanoparticles (NPs) plays an important role on ecosystems. Here we compare the stability of monometallic nanoparticles (Au NPs and Ag NPs) to their corresponding bimetallic counterparts (Ag-Au NPs). The surface plasmon resonance of Ag NPs and Au NPs provides easy access toward determining the stability. Five different organophosphorus pesticides (ethion, parathion, malathion, fenthion and paraxon-ethyl) were examined. The four pesticides (ethion, parathion, malathion and fenthion) led to significant aggregation of the NPs, however, in the presence of humic acids (HA), no aggregation occurred. Among the three different plasmonic NPs, Ag-Au NPs showed the highest stability with the pesticides compared to Ag NPs alone or Au NPs alone with the pesticides.<br/>

Influence of organophosphorus pesticides on the stability of plasmonic nanoparticles in the presence of dissolved organic matter

253rd National Meeting (2017)

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