The news reporters obtained a quote from the research, "We investigated 4 different nanomaterials (C-60, CeO2, SiO2-Ag and PVP-Ag) in 6 different water types ranging from a small stream to seawater. In the presence of natural colloids, sedimentation rates ranged from 0.0001 m d(-1) for SiO2-Ag to 0.14 m d(-1) for C-60. The apparent rates of heteroaggregation between nanomaterials and natural colloids were estimated using a novel method that separates heteroaggregation from homoaggregation using a simplified Smoluchowski-based aggregation-settling equation applied to data from unfiltered and filtered waters. The heteroaggregation rates ranged between 0.007 and 0.6 L mg(-1) day(-1), with the highest values observed in seawater."
According to the news reporters, the research concluded: "We argue that such system specific parameters are key to the development of dedicated water quality models for ENMs."
For more information on this research see: Heteroaggregation and sedimentation rates for nanomaterials in natural waters.
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