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000865860 1001_ $$0P:(DE-HGF)0$$aAdrian, Yorck F.$$b0
000865860 245__ $$aTransport and retention of engineered silver nanoparticles in carbonate-rich sediments in the presence and absence of soil organic matter
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000865860 520__ $$aThe transport and retention behavior of polymer- (PVP-AgNP) and surfactant-stabilized (AgPURE) silver nanoparticles in carbonate-dominated saturated and unconsolidated porous media was studied at the laboratory scale. Initial column experiments were conducted to investigate the influence of chemical heterogeneity (CH) and nano-scale surface roughness (NR) arising from mixtures of clean, positively charged calcium carbonate sand (CCS), and negatively charged quartz sands. Additional column experiments were performed to elucidate the impact of CH and NR arising from the presence and absence of soil organic matter (SOM) on a natural carbonate-dominated aquifer material. The role of the nanoparticle capping agent was examined under all conditions tested in the column experiments. Nanoparticle transport was well described using a numerical model that facilitated blocking on one or two retention sites. Results demonstrate that an increase in CCS content in the artificially mixed porous medium leads to delayed breakthrough of the AgNPs, although AgPURE was much less affected by the CCS content than PVP-AgNPs. Interestingly, only a small portion of the solid surface area contributed to AgNP retention, even on positively charged CCS, due to the presence of NR which weakened the adhesive interaction. The presence of SOM enhanced the retention of AgPURE on the natural carbonate-dominated aquifer material, which can be a result of hydrophobic or hydrophilic interactions or due to cation bridging. Surprisingly, SOM had no significant impact on PVP-AgNP retention, which suggests that a reduction in electrostatic repulsion due to the presence of SOM outweighs the relative importance of other binding mechanisms. Our findings are important for future studies related to AgNP transport in shallow unconsolidated calcareous and siliceous sands.
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000865860 7001_ $$0P:(DE-HGF)0$$aSchneidewind, Uwe$$b1
000865860 7001_ $$0P:(DE-HGF)0$$aBradford, Scott A.$$b2$$eCorresponding author
000865860 7001_ $$0P:(DE-HGF)0$$aŠimůnek, Jirka$$b3
000865860 7001_ $$0P:(DE-Juel1)129484$$aKlumpp, Erwin$$b4
000865860 7001_ $$0P:(DE-HGF)0$$aAzzam, Rafig$$b5
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