Increased use of silver nanoparticles in a variety of consumer products has elevated the potential of release and toxicity in the environment.  Since Ag+ ion is considered to cause toxicity, it is critical to determine ion dissolution from nanoparticles in ecologically relevant conditions.  In this work, we utilized ion selective electrodes with an ionophore-doped fluorous phase membrane to selectively, sensitively, and dynamically measure the concentration of Ag+ release from citrate-capped Ag nanoparticles over time in water, bacterial growth broth, or simulated natural water.  Nanoparticles were characterized with TEM, zeta-potential, and UV-vis and stability of the nanoparticles were monitored over time using dynamic light scattering.  Additionally, bacterial toxicity studies, including colony counting and growth curve analysis, were performed with the bacteria Shewanella oneidensis to understand the toxicity of the nanoparticles and the relevant Ag+ concentrations.  Results indicate increased ion dissolution over time and Ag+ ions cause changes in S. oneidensis growth.

Assessment of ion dissolution from silver nanoparticles using ion selectrive electrodes and subsequent toxicity studies in <i>Shewanella oneidensis</i>

243rd National Meeting (2012)

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Assessment of ion dissolution from silver nanoparticles using ion selectrive electrodes and subsequent toxicity studies in Shewanella oneidensis