Storage and behavior of As, Sb, Pb, and Cu in ombrotrophic peat bogs under contrasting water table conditions.
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 northwest 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. Stable Pb isotope ratios reveal 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 interannual fluctuations. These conditions have not affected the integrity of the Pb and Cu records but have caused postdepositional mobilization 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.
Upland Environments Research Unit, School of Environment and Development, The University of Manchester, Manchester M13 9PL, UK. james.rothwell@manchester.ac.uk
James J
JJ
Rothwell
Kevin G
KG
Taylor
Simon R N
SR
Chenery
Andrew B
AB
Cundy
Martin G
MG
Evans
Timothy E H
TE
Allott
D000965:Antimony / Q000032:analysis; D001151:Arsenic / Q000032:analysis*; D003300:Copper / Q000032:analysis; D004739:England; D004784:Environmental Monitoring; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D044003:Sphagnopsida; D058438:Water Cycle; D014874:Water Pollutants, Chemical / Q000032:analysis*
D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D007854:Lead; D003300:Copper; D000965:Antimony; D001151:Arsenic