Friday, October 28, 2011
Room A2/A7 (San Jose Convention Center)
Increasing use of nanomaterials in commercial products has led to widespread concerns about their potential environmental and health impacts. To better understand the transport, fate and behavior of nanoparticles in aquatic systems, it is essential to understand their interactions with different components of natural waters including natural organic matter over a broad range of physicochemical conditions. CeO2 and TiO2 nanoparticles are widely used in many consumer and industrial applications. Aggregation rates of CeO2 and TiO2 nanoparticles over a broad range of solution (pH and ionic strength) conditions, and the effects of the Suwanee River humic acid (HA) on particle sedimentation behavior were evaluated. Nanoparticle sizes having a dry nominal diameter of 30 nm are characterized by dynamic light scattering and microscopy.