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dc.contributor.authorSwindle, Andrew L.
dc.contributor.authorCozzarelli, Isabelle M.
dc.contributor.authorMadden, Andrew S. Elwood
dc.identifier.citationSwindle, Andrew L.; Cozzarelli, Isabelle M.; Madden, Andrew S. Elwood. 2015. Using chromate to investigate the impact of natural organics on the surface reactivity of nanoparticulate magnetite. Environmental Science and Technology,vol. 49:no. 4:pp 2156–2162en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractChromate was used as a chemical probe to investigate the size-dependent influence of organics on nanoparticle surface reactivity. Magnetitechromate sorption experiments were conducted with similar to 90 and similar to 6 nm magnetite nanoparticles in the presence and absence of fulvic acid (FA), natural organic matter (NOM), and isolated landfill leachate (LL). Results indicated that low concentrations (1 mg/L) of organics had no noticeable impact on chromate sorption, whereas concentrations of 50 mg/L or more resulted in decreased amounts of chromate sorption. The adsorption of organics onto the magnetite surfaces interfered equally with the ability of the 6 and 90 nm particles to sorb chromate from solution, despite the greater surface area of the smaller particles. Results indicate the presence of organics did not impact the redox chemistry of the magnetite-chromate system over the duration of the experiments (8 h), nor did the organics interact with the chromate in solution. Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM) results indicate that the organics blocked the surface reactivity by occupying surface sites on the particles. The similarity of results with FA and NOM suggests that coverage of the reactive mineral surface is the main factor behind the inhibition of surface reactivity in the presence of organics.en_US
dc.description.sponsorshipThe authors would like to acknowledge USGS scientists Jeanne Jaeschke for analytical support along with Jason Masoner and Kevin Smith for field support. This research was supported by the USGS Toxic Substances Hydrology Program and the USGS National Research Program.en_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofseriesEnvironmental Science and Technology;v.49:no.4
dc.subjectAtomic-force microscopyen_US
dc.titleUsing chromate to investigate the impact of natural organics on the surface reactivity of nanoparticulate magnetiteen_US
dc.rights.holderCopyright © 2015 American Chemical Society

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