NDLI: Quantifying the influence of EDTA on polymer nanoparticle deposition and retention in an iron-oxide-coated sand column

Content Provider	Royal Society of Chemistry (RSC)
Author	Liang, Dongxu Deng, Shihuai Yang, Xinyao
Copyright Year	2012
Abstract	Ethylenediaminotetraacetic acid (EDTA) occurring in groundwater aquifers complicates the prediction of nanoparticle movement in the porous medium. This paper demonstrates an approach combining Triple Pulse Experiments (TPEs) and numerical modelling to quantify the influence of EDTA on the deposition and retention of polymer nanoparticles in a water-saturated column packed with iron-oxide-coated sand. TPEs injecting three successive pulses in the order of nanoparticle, EDTA, nanoparticle permit nanoparticle deposition in the absence and the presence of EDTA to be compared. Random Sequential Adsorption (RSA) modelling of the nanoparticle breakthrough curves combining mass balance calculation allows the influence of EDTA to be quantified. TPE results demonstrate that the injected EDTA eluted the oxide coatings (favorable deposition sites) from the sand surface and the resulting decline in sites led to enhanced nanoparticle mobility in the subsequent pulse. Quantification results suggest that at the experimental time-scale and under the controlled conditions, elution of one deposition site requires injection of 2.4 × 1011 EDTA molecules. In total, 75 gram EDTA needs to be injected to remove all the column sites.
Starting Page	2392
Ending Page	2398
Page Count	7
File Format	HTM / HTML PDF
ISSN	14640325
Volume Number	14
Issue Number	9
Journal	Journal of Environmental Monitoring
DOI	10.1039/c2em30145h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	EDTA Acid Ethylenediaminetetraacetic acid Groundwater Nanoparticle Polymer Nanoparticle deposition Adsorption Gram
Content Type	Text
Resource Type	Article
Subject	Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law

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