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Zahn, M.T. ; Seiler, K.-P.

Field Studies on the Migration of Arsenic and Cadmium in a Carbonate Gravel Aquifer Near Munich (F.R.G.).

J. Hydrol. 133, 201-214 (1992)
DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
 The migration of arsenic and cadmium species in ground water was investigated with the aid of tracer experiments at a test site in a fluvioglacial aquifer. Experimental breakthrough curves, obtained under natural flow conditions, characterize the migration of arsenic and cadmium species in the ground water in relation to a conservative tracer. Transport velocities of arsenic species corresponded to those of the groundwater flow and resulted in a rapid breakthrough in the observation wells. The recovery of the arsenic species, calculated with respect to the conservative tracer, averaged about 50%. Intensity of sorption increased with decreasing concentrations of arsenic species. The migration of cadmium species, however, was controlled by chemical precipitation of otavite and a slow redissolution of this compound. The breakthrough of cadmium in the observation wells, thus, was much slower with respect to the water movement. A recovery of about 40% was observed after more than 1 year of observation. Increased concentrations of chloride or/and sulphate resulted in remobilization of cadmium. Breakthrough curves are described by a commonly used dispersion model. It appears that a retardation factor is not sufficient to describe the asymmetrical breakthrough curves; it must be supplemented by recovery rates and a specific dispersivity, defined by the time variance of concentration at a given point. Longer flow distances or lower initial concentrations caused reduced recoveries, higher specific dispersivities and retardations both for arsenic and for cadmium species.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
ISSN (print) / ISBN 0022-1694
e-ISSN 1879-2707
Zeitschrift Journal of Hydrology
Quellenangaben Band: 133, Heft: 3-4, Seiten: 201-214 Artikelnummer: , Supplement: ,
Verlag Elsevier
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Groundwater Ecology (IGOE)