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Silver Nanoparticle Impact on Bacterial Growth: Effect of pH,Concentration, and Organic Matter

Fabrega, Julia and Fawcett, Shona R and Renshaw, Joanna C and Lead, Jamie R (2009) Silver Nanoparticle Impact on Bacterial Growth: Effect of pH,Concentration, and Organic Matter. Environmental Science and Technology, 43 (19). pp. 7285-7290. ISSN 0013-936X

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URL of Published Version: http://pubs.acs.org/doi/pdf/10.1021/es803259g

Identification Number/DOI: 10.1021/es803259g

Silver nanoparticles (Ag NPs) are widely used as antibacterial agents. This antibacterial property carries with it a potential environmental risk once these NPs are discharged into the environment. This study investigated the impact on Pseudomonas fluorescens over a 24 h exposure of well characterized Ag NPs at pH values of 6-9, in the presence and absence of Suwannee River humic acids (SRHA). Ag NPs were characterized by size, aggregation, morphology, dissolution, and surface properties under all conditions.
Solubility was low (less than 2%) for all Ag NP concentrations (2-2000 ppb) and under all conditions was less than 40 ppb (0.38 μM). SRHA caused a partial disaggregation of Ag NP aggregates by nanoscale film formation, with individual NPs stabilized by charge and entropically driven steric effects.Dissolved Ag reduced bacterial growth entirely at 2000 ppb (19 μM)under all conditions and adversely affected growth at 200 ppb (1.9 μM) under some conditions, indicating some toxicity.
The Ag NPs showed similar toxicity at 2000 ppb (19 μM) in the absence of SRHA and at pH 9 only i.e. SRHA mitigated bactericidal action. Solubility and interactions with SRHA indicate that there was a specific nanoparticle effect, which could not be explained by the effect of dissolved Ag.

Type of Work:Article
Date:08 June 2009 (Publication)
School/Faculty:Colleges (2008 onwards) > College of Life & Environmental Sciences
Department:School of Geography, Earth and Environmental Sciences
Subjects:G Geography (General)
GE Environmental Sciences
Institution:University of Birmingham
Copyright Holders:American Chemical Society
ID Code:265
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