Heteroaggregation and sedimentation rates for nanomaterials in natural waters

Autor: Albert A. Koelmans, Marja Wouterse, Joris T.K. Quik, I. Velzeboer, D. van de Meent
Rok vydání: 2013
Předmět:
Aquatic Ecology and Water Quality Management
Water flow
zwevende deeltjes
Colloid
colloids
emission
sedimentatie
colloïden
Waste Management and Disposal
Water Science and Technology
chemistry.chemical_classification
Suspended solids
nanotechnology
Chemistry
Ecological Modeling
aggregation
zeewater
Pollution
Wageningen Marine Research
Environmental chemistry
aggregation kinetics
aquatic environments
suspended solids
sedimentation
schatting
ceo2 nanoparticles
silver nanoparticles
Environmental Engineering
water flow
sea water
manufactured nanoparticles
oppervlaktewaterkwaliteit
engineered nanomaterials
nanotechnologie
Settling
Organic matter
Colloids
organic-matter
Civil and Structural Engineering
aggregatie
WIMEK
carbon nanotubes
estimation
Environmental engineering
Water
Sedimentation
Aquatische Ecologie en Waterkwaliteitsbeheer
Nanostructures
emissie
Solubility
exposure
fate
Seawater
Water quality
waterstroming
surface water quality
Environmental Sciences
Zdroj: Water Research, 48, pp. 269-279
Water Research, 48, 269-279
Water Research 48 (2014) 1
Water Research, 48(1), 269-279
ISSN: 1879-2448
0043-1354
Popis: Exposure modeling of engineered nanomaterials requires input parameters such as sedimentation rates and heteroaggregation rates. Here, we estimate these rates using quiescent settling experiments under environmentally relevant conditions. We investigated 4 different nanomaterials (C60, 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 C60. 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. We argue that such system specific parameters are key to the development of dedicated water quality models for ENMs.
Databáze: OpenAIRE
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