Computer Science
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2059f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 9, pp.2059-2067
Computer Science
3
Scientific paper
Concentrations of arsenic in surface or near-surface sediment in 12 of 13 cores from the three major basins of Loch Lomond are substantially enhanced, up to 675 mg/kg compared with background values of 15-50 mg/kg. Sedimentary As profiles are attributed to post-depositional enrichment processes since there are no recent significant sources of environmental As contamination, anthropogenic or natural, in the Loch Lomond area. The enrichments can be interpreted in terms of post-depositional diagenetic remobilization processes in sediment reducing zones, followed by upward migration of As through interstitial waters and oxidation/adsorption/precipitation reactions in near-surface oxidizing layers. Confirmation of the diagenetic/adsorption hypothesis is provided directly by the analysis of As species (1.5-81 g/l) in pore water and indirectly via comparison with sedimentary phosphorus.
Farmer John G.
Lovell M. A.
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