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Sampling for silver nanoparticles in aqueous media using a rotating disk electrode: evidence for selective sampling of silver nanoparticles in the presence of ionic silver

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Abstract

Amendment of a carbon paste electrode consisting of graphite and Nujol®, with a variety of organic and inorganic materials, allows direct adsorption of silver nanoparticles (AgNPs) from aqueous solution in either open or close circuit modes. The adsorbed AgNPs are detected by stripping voltammetry. Detection limits of less than 1 ppb Ag are achievable with a rotating disk system. More than one silver peak was apparent in many of the stripping voltammograms. The appearance of multiple peaks could be due to different species of silver formed upon stripping or variation in the state of aggregation or size of nanoparticles. With most of these packing materials, dissolved Ag+ was also extracted from aqueous solution, but, with a packing material made with Fe(II,III) oxide nanoparticles, only AgNPs were extracted. Therefore, it is the best candidate for determination of metallic AgNPs in aqueous environmental samples without interference from Ag+.

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Acknowledgements

The US Environmental Protection Agency through its Office of Research and Development funded, managed, and collaborated in the research described here under contract EP-11-D-1618 to the University of Nevada, Las Vegas. It has been subjected to agency review and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

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Authors and Affiliations

  1. Department of Chemistry, University of Nevada, Las Vegas, NV, 89154-4003, USA

    Spencer Steinberg & Vernon Hodge

  2. National Exposure Research Laboratory, United States Environmental Protection Agency, Las Vegas, NV, 89119,, USA

    Brian Schumacher & Wayne Sovocool

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  1. Spencer Steinberg
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  2. Vernon Hodge
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  3. Brian Schumacher
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  4. Wayne Sovocool
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Correspondence to Spencer Steinberg.

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Steinberg, S., Hodge, V., Schumacher, B. et al. Sampling for silver nanoparticles in aqueous media using a rotating disk electrode: evidence for selective sampling of silver nanoparticles in the presence of ionic silver. Environ Monit Assess 189, 99 (2017). https://doi.org/10.1007/s10661-017-5809-6

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