Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 554082
Title Iron, cobalt, and gadolinium transport in methanogenic granules measured by 3D magnetic resonance imaging
Author(s) Bartacek, Jan; Vergeldt, Frank J.; Maca, Josef; Gerkema, Edo; As, Henk Van; Lens, Piet N.L.
Source Frontiers in Environmental Science 4 (2016)MAR. - ISSN 2296-665X
DOI https://doi.org/10.3389/fenvs.2016.00013
Department(s) Biophysics
EPS
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Granular biofilm - Magnetic resonance microscopy - Metal diffusion - Metal transport - Methanogenic granular sludge
Abstract

Description of processes such as bioaccumulation, bioavailability and biosorption of heavy metals in biofilm matrixes requires the quantification of their transport. This study shows 3D MRI measurements of the penetration of free (Fe 2+ , Co 2+ and Gd 3+ ) and complexed ([FeEDTA] 2- and [GdDTPA] 2- ) metal ions in a single methanogenic granule. Interactions (sorption or precipitation) between free metals and the biofilm matrix result in extreme shortening of the spin-spin relaxation time (T 2 ) and a decrease of the amplitude (A 0 ) of the MRI signal, which hampers the quantification of the metal concentration inside the granular sludge matrix. MRI images clearly showed the presence of distinct regions (dead or living biomass, cracks, and precipitates) in the granular matrix, which influenced the metal transport. For the free metal ions, a reactive barrier was formed that moved through the granule, especially in the case of Gd 2+ . Chelated metals penetrated faster and without reaction front. Diffusion of [GdDTPA] 2- could be quantified, revealing the course of its transport and the uneven (0.2-0.4 mmolL -1 ) distribution of the final [GdDTPA] 2- concentration within the granular biofilm matrix at equilibrium.

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