Storage and behaviour of As, Sb, Pb and Cu in ombrotrophic peat bogs under contrasting water table conditions

Rothwell, J.J., Taylor, K.G., Chenery, S., Cundy, A.B., Evans, M.G. and Allott, T.E.H. (2010) Storage and behaviour of As, Sb, Pb and Cu in ombrotrophic peat bogs under contrasting water table conditions Environment Science and Technology, 44 (22). pp. 8497-8502. ISSN 0013-936X

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Abstract

Concentration depth profiles and inventories of solid-phase As, Sb, Pb and Cu were determined in 210Pb-dated cores from an ombrotrophic peat bog in NW England. Cores were collected from the peat dome and adjacent to an eroding gully. Down-core distributions of As, Sb, Pb and Cu in the dome core are almost identical. The water table is close to the dome surface with only short-term draw-down. Under these conditions, As, Sb, Pb and Cu are immobile, allowing the reconstruction of trends in historical contaminant deposition. The peak in atmospheric deposition of As, Sb, Pb and Cu (4.59, 2.78, 147 and 26.7 mg m–2 y–1, respectively) occurred during the late 19th century. The 206Pb/207Pb ratio reveals that Pb deposition during this period was from indigenous and foreign sources. The mean water table is much lower at the gully-edge and there are pronounced inter-annual fluctuations. These conditions have not affected the integrity of the Pb and Cu records, but have caused post-depositional mobilisation and redistribution of As and Sb. Cumulative inventories show significant loss of As and Sb at the gully-edge site. Long-term water table draw-down in ombrotrophic peat bogs has the potential to alter the geochemistry and fate of previously deposited As and Sb.

Item Type: Journal article
Subjects: F000 Physical Sciences > F800 Physical Geography and Environmental Sciences > F850 Environmental Sciences
DOI (a stable link to the resource): 10.1021/es101150w
Faculties: Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology > Ecology, Landscape and Pollution Management
Faculty of Science and Engineering > School of Environment and Technology
Depositing User: editor environment
Date Deposited: 23 Nov 2010 08:53
Last Modified: 24 Apr 2012 08:30
URI: http://eprints.brighton.ac.uk/id/eprint/7900

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