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A Method for Preparing Silver Nanoparticle Suspensions in Bulk for Ecotoxicity Testing and Ecological Risk Assessment

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Abstract

Methods are needed to prepare stable suspensions of engineered nanoparticles in aqueous matrixes for ecotoxicity testing and ecological risk assessments. We developed a novel method of preparing large volumes of silver nanoparticles (AgNP) in suspension using a commercially available rotor–stator dispersion mill. AgNP in powder form (PVP capped, 30–50 nm) was suspended in deionized water and natural lake water at 1 g/L and the addition of 0.025% (w/v) gum arabic (GA) increased stability over 2 weeks after preparation. The concentrations of total and dissolved Ag in the suspensions did not change significantly over this period. Analysis of hydrodynamic diameters of the major peaks in suspension using dynamic light scattering showed that suspensions prepared with GA were stable, and this was confirmed by single-particle ICP-MS analysis. This method for dispersing AgNPs provides an inexpensive, yet reliable method for preparing suspensions for toxicity testing and ecosystem level studies of the fate and biological effects of AgNPs in aquatic ecosystems.

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Acknowledgements

The authors thank M. E. Hoque and B. Seaborn at Trent University for their technical assistance, L. Shen and V. Yargeau at McGill University for the TEM photomicrographs, and T. Kritzer at Kady® International for providing advice on how to optimize mill parameters for preparing AgNP suspensions

Funding

Funding was provided by the Natural Sciences and Engineering Research Council (NSERC) of Canada through the Strategic Grants Program (#413230-2011).

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Correspondence to Chris D. Metcalfe.

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Martin, J.D., Telgmann, L. & Metcalfe, C.D. A Method for Preparing Silver Nanoparticle Suspensions in Bulk for Ecotoxicity Testing and Ecological Risk Assessment. Bull Environ Contam Toxicol 98, 589–594 (2017). https://doi.org/10.1007/s00128-017-2067-9

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  • DOI: https://doi.org/10.1007/s00128-017-2067-9

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