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Article << Previous     |     Next >>   Contents Vol 11(4)

The persistence and transformation of silver nanoparticles in littoral lake mesocosms monitored using various analytical techniques

Lindsay M. Furtado A , Md Ehsanul Hoque A , Denise M. Mitrano B D , James F. Ranville B , Beth Cheever C E , Paul C. Frost C , Marguerite A. Xenopoulos C , Holger Hintelmann A and Chris D. Metcalfe A F

A Trent University, Water Quality Center, 1600 Westbank Drive, Peterborough, ON, K9J 7B8, Canada.
B Colorado School of Mines, Department of Chemistry and Geochemistry, 1500 Illinois Street, Golden, CO 80401, USA.
C Trent University, Department of Biology, 1600 Westbank Drive, Peterborough, ON, K9J 7B8, Canada.
D Present address: Empa – Swiss Federal Laboratories for Materials Science and Technology, Technology and Society Laboratory, Lerchenfeldstrasse 5, CH-9014 St Gallen, Switzerland.
E Present address: Michigan State University, Department of Microbiology and Molecular Genetics, 220 Trowbridge Road, East Lansing, MI 48824, USA.
F Corresponding author. Email: cmetcalfe@trentu.ca

Environmental Chemistry 11(4) 419-430 http://dx.doi.org/10.1071/EN14064
Submitted: 31 March 2014  Accepted: 27 May 2014   Published: 25 August 2014


 
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Environmental context. Silver nanoparticles discharged with municipal wastewater may contaminate surface waters and harm aquatic ecosystems. We applied several analytical techniques to investigate the persistence and transformation of silver nanoparticles in a natural lake environment, and show, through multiple lines of evidence, that they persisted in lake water for several weeks after addition. The nanoparticles were releasing silver ions through dissolution, but these toxic ions were likely binding with natural organic matter in the lake water.

Abstract. Silver nanoparticles (AgNPs) may be released into surface waters, where they can affect aquatic organisms. However, agglomeration, dissolution, surface modifications and chemical speciation are important processes that control the toxicity of AgNPs. The purpose of the study was to apply various methods for monitoring the persistence and transformation of AgNPs added to littoral lake mesocosms. Analysis of total Ag showed that the levels in the mesocosms declined rapidly in the first 12 h after addition, followed by a slower rate of dissipation with a half-life (t1/2) of ~20 days. Analysis using single particle ICP-MS (spICP-MS) showed no evidence of extensive homo-agglomeration of AgNPs. The stability of AgNPs was likely due to the low ionic strength and high concentrations of humic-rich dissolved organic carbon (DOC) in the lake water. Analyses by spICP-MS, cloud point extraction (CPE) and asymmetric flow field flow fractionation coupled to ICP-MS (AF4-ICP-MS) all indicated that the concentrations of AgNP decreased over time, and the nanoparticles underwent dissolution. However, the concentrations of dissolved silver, which includes Ag+, were generally below detection limits when analysed by centrifugal ultrafiltration and spICP-MS. It is likely that the majority of free ions released by dissolution were complexing with natural organic material, such as DOC. An association with DOC would be expected to reduce the toxicity of Ag+ in natural waters. Overall, we were able to characterise AgNP transformations in natural waters at toxicologically relevant concentrations through the use of multiple analytical techniques that compensate for the limitations of the individual methods.



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