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Zahn, M.T. ; Seiler, K.-P.

Field Studies on Migration of Arsenic and Cadmium in a Carbonatic Gravel-Sand Aquifer.

J. Hydrol. 133, 201-214 (1990)
DOI
Open Access Green as soon as Postprint is submitted to ZB.
The migration of arsenic and cadmium species in ground water was investigated with the aid of tracer experiments at a test site in a fluvinglacial aquifer. Experimental breakthrought 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 weells. 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 dispersitivity, 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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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
ISSN (print) / ISBN 0022-1694
e-ISSN 1879-2707
Journal Journal of Hydrology
Quellenangaben Volume: 133, Issue: 3-4, Pages: 201-214 Article Number: , Supplement: ,
Publisher Elsevier
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Groundwater Ecology (IGOE)