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Environ Pollut. 2013 Sep;180:152-8. doi: 10.1016/j.envpol.2013.05.031. Epub 2013 Jun 12.

Limited transport of functionalized multi-walled carbon nanotubes in two natural soils.

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1
Agrosphere Institute (IBG-3), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany. d.kasel@fz-juelich.de

Abstract

Column experiments were conducted in undisturbed and in repacked soil columns at water contents close to saturation (85-96%) to investigate the transport and retention of functionalized (14)C-labeled multi-walled carbon nanotubes (MWCNT) in two natural soils. Additionally, a field lysimeter experiment was performed to provide long-term information at a larger scale. In all experiments, no breakthrough of MWCNTs was detectable and more than 85% of the applied radioactivity was recovered in the soil profiles. The retention profiles exhibited a hyper-exponential shape with greater retention near the column or lysimeter inlet and were successfully simulated using a numerical model that accounted for depth-dependent retention. In conclusion, results indicated that the soils acted as a strong sink for MWCNTs. Little transport of MWCNTs is therefore likely to occur in the vadose zone, and this implies limited potential for groundwater contamination in the investigated soils.

KEYWORDS:

Carbon nanotube; Lysimeter; Retention profile; Transport modeling; Undisturbed soil

PMID:
23770315
DOI:
10.1016/j.envpol.2013.05.031
[Indexed for MEDLINE]
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