Mobility and diagenesis of Pb and 210 Pb in peat

Details Mobility and diagenesis of Pb and 210 Pb in peat Mobility and diagenesis of Pb and 210 Pb in peat

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.3329u&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 54, Issue 12, pp.3329-3346

Other

12

Scientific paper

Peatlands long have been considered to preserve the record of atmospheric deposition of anthropogenic contaminants such as Pb. In the past two decades, 210 Pb has been widely used to date recent strata of peat and to calculate accumulation rates. The assumption that Pb and 210 Pb are immobile and not subject to diagenesis in peat has been questioned but not rigorously tested. We attempted to determine if Pb is mobile in peatlands and if Pb profiles are altered by diagenic processes by constructing a mass balance for Pb about a small peatland, by comparing inventories, concentrations and accumulation rates of Pb and 210 Pb in peatlands across northeastern North America and by examining the relationship between concentrations of Pb in bog waters and peat in numerous sites. Our results clearly demonstrate that Pb and 210 Pb are mobilized by the organic-rich waters of peatlands. Profiles of Pb and 210 Pb at depths below the water table do not preserve the record of atmospheric deposition and inventories of Pb and 210 Pb are depleted in peatland hollows. Concentrations of Pb in bog waters are regulated by the concentration of Pb in the peat and the concentration of dissolved organic carbon. The mass balance for one bog indicated that over the specific three-year period of study more than 30% of inputs of Pb were not retained within the peat. As a result of this mobility, dates based on 210 Pb can be biased and inaccurate by as much as 30 years. Dates based on 210 Pb should be verified by other techniques, especially when the inventory of 210 Pb is less than that expected from local rates of deposition.

Affiliated with

Also associated with

No associations

Rating

Mobility and diagenesis of Pb and 210 Pb in peat does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Mobility and diagenesis of Pb and 210 Pb in peat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mobility and diagenesis of Pb and 210 Pb in peat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1630529