TY  - JOUR
A1  - Mitreiter, Ivonne
A1  - Oswald, Sascha Eric
A1  - Stallmach, Frank
T1  - Magnetic resonance measurements of iron turn-over in sands
T1  - Magnetresonanz-Messung von Eisenumsatzprozessen in Sanden
BT  - Nicht-invasive Charakterisierung von Reaktionsabläufen
BT  - non-invasive characterization of reaction processes
JF  - Grundwasser : Zeitschrift der Fachsektion Hydrogeologie in der Deutschen Gesellschaft für Geowissenschaften (FH-DGG)
N2  - In this study, Nuclear Magnetic Resonance (NMR), a non-destructive measurement technique, has been applied for investigation of iron turn-over processes. In non-invasive laboratory experiments, iron dissolution and precipitation reactions in saturated natural sands were observed spatially and temporally. These processes play an important role in groundwater with varying redox and pH conditions. Redox reactions turning Fe2+ into Fe3+ and Fe3+ into Fe2+ were detected in aqueous solution by the difference in magnetic relaxation times. Furthermore, the spatial distribution of the iron reduction reaction, the consumption and diffusive transfer to and from the reaction sites, was observed in a 1D set-up with natural sands. The achieved spatial resolution was less than one millimetre while repeating measurements every half an hour. It showed the system changing from diffusion-limited to reaction-limited.
KW  - Nuclear magnetic resonance
KW  - Ferric iron
KW  - Ferrous iron
KW  - Acidification
KW  - Redox reaction
KW  - Reactive transport modelling
Y1  - 2011
U6  - https://doi.org/10.1007/s00767-011-0177-6
SN  - 1430-483X
VL  - 16
IS  - 4
SP  - 269
EP  - 278
PB  - Springer
CY  - Heidelberg
ER  -