Wei Zhang - A rapid screening technique for estimating nanoparticle transport in porous media

Document created by Wei Zhang on Aug 22, 2014
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  Publication Details (including relevant citation   information): Bouchard, Dermont, Zhang, Wei, Chang,   Xiaojun, Water Research (0)

  Abstract: Quantifying the mobility of engineered   nanoparticles in hydrologic pathways from point of release to   human or ecological receptors is essential for assessing   environmental exposures. Column transport experiments are a   widely used technique to estimate the transport parameters of   engineered nanoparticles in the subsurface environment, but this   technique is often time-consuming, labor-intensive, and of low   sample throughput. Thus, the traditional column experiment is   unlikely to be a viable tool for processing the large numbers of   engineered nanomaterials in various types of porous media that   will be needed for environmental impact assessment and regulatory   activities. Here we present a high throughput screening technique   for nanoparticle transport using 96 deep well plate columns   packed with porous media. The technique was tested for the   transport of 60-nm polystyrene microspheres, fullerene C60   nanoparticles (aq/nC60), and surfactant-wrapped single-walled   carbon nanotubes (SWNTs) in 0.001–0.1% sodium dodecyl sulfate   (SDS) through Iota quartz sand and Calls Creek sediment. Our   results showed that this screening technique produced highly   reproducible column hydrodynamic properties as revealed by   conservative tracer tests and precise measurements of   nanoparticle transport parameters. Additionally, all   nanoparticles exhibited greater retention in the sediment than in   Iota quartz, and the retention of SDS-SWNTs decreased with   increasing SDS concentrations, which is consistent with the   existing literature. We conclude that this technique is well   suited for rapidly screening the mobility of engineered   nanomaterials in porous media.

  Address (URL): http://www.sciencedirect.com/science/article/pii/S0043135412007403