title: MRI observation of heavy metal transport in aquifer matrices down to sub-mg quantities.
abstract: In this contribution, we report results from MRI studies of the propagation of heavy metal ions through columns packed with sandy aquifer materials. Both sorption of low concentrations of heavy metal ions from water flowing through the column and the formation of sorption traces produced from initially localized higher concentrations of heavy metal ions, and the remobilisation of adsorbed ions with time and changing hydrochemical conditions were studied. Multislice spin-echo and FLASH techniques were used for the imaging experiments. Advantages and problems of the different imaging protocols for the study of aquifer materials are discussed.
authors.affiliation: Institute of Hydrochemistry, Technische Universität München, Marchioninistrasse 17, D-81377 München, Germany. nikolaus.nestle@physik.tu-darmstadt.de
authors.forename: Nikolaus
authors.initials: N
authors.lastname: Nestle
authors.forename: Thomas
authors.initials: T
authors.lastname: Baumann
authors.forename: Arthur
authors.initials: A
authors.lastname: Wunderlich
authors.forename: Reinhard
authors.initials: R
authors.lastname: Niessner
mesh_terms: D000327:Adsorption; D007700:Kinetics; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D008962:Models, Theoretical; D012822:Silicon Dioxide; D012989:Soil Pollutants / Q000032:analysis*; D014881:Water Supply
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants; D012822:Silicon Dioxide