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Early diagenesis and isotopic composition of lead in Lake Laisan, northern Sweden

Widerlund, A; Roos, Per LU ; Gunneriusson, L; Ingri, J and Holmstrom, H (2002) In Chemical Geology 189(3-4). p.183-197
Abstract
Water column (dissolved/suspended phase, sediment traps) and sediment data (pore-water, solid-phase sediment) were combined with stable Pb and Pb-210 isotope data to trace the early diagenetic behaviour and geochemical cycling of Pb in Lake Laisan, a lake which has received large quantities of anthropogenic Pb since the early 1940s. Early diagenetic remobilisation of Pb is indicated by a subsurface pore-water Pb maximum (120 mug 1(-1)) in the oxic surface layer of the sediment, where the solid-phase Pb concentration is 3400-4600 mug g(-1). The remobilisation of Pb appears to be caused by a pH-controlled desorption of Pb from solid-phase sediment, which is consistent with a model describing surface complexation of Pb(II) on hydrous goethite... (More)
Water column (dissolved/suspended phase, sediment traps) and sediment data (pore-water, solid-phase sediment) were combined with stable Pb and Pb-210 isotope data to trace the early diagenetic behaviour and geochemical cycling of Pb in Lake Laisan, a lake which has received large quantities of anthropogenic Pb since the early 1940s. Early diagenetic remobilisation of Pb is indicated by a subsurface pore-water Pb maximum (120 mug 1(-1)) in the oxic surface layer of the sediment, where the solid-phase Pb concentration is 3400-4600 mug g(-1). The remobilisation of Pb appears to be caused by a pH-controlled desorption of Pb from solid-phase sediment, which is consistent with a model describing surface complexation of Pb(II) on hydrous goethite surfaces. The diffusive Pb flux from the subsurface pore-water maximum towards the sediment surface (36 mug cm(-2) year(-1)) exceeds the depositional Pb flux (8.6 mug cm(-2) year(-1)) by approximately a factor of four, indicating that Pb is highly mobile in the sediment. Stable Pb isotope data and a mass balance calculation suggest that Pb diffusing upwards is, to a large extent, trapped in the surface sediment. Lead that may diffuse into the slightly alkaline lake water appears to be efficiently sorbed to suspended particulate matter, resulting in low dissolved Pb concentrations in the water column (0.040-0.046 mug 1(-1)). Sorption of Pb to suspended particulate matter is consistent with the elevated suspended particulate Pb concentrations in the hypolimnion (3800-4000 mug g(-1)), and the fact that the stable Pb isotopic compositions of suspended matter and pore-water are similar. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
pore-water, early diagenesis, lead isotopes, Lake Laisan, Laisvall
in
Chemical Geology
volume
189
issue
3-4
pages
183 - 197
publisher
Elsevier
external identifiers
  • wos:000177943400003
  • scopus:0037201040
ISSN
0009-2541
DOI
10.1016/S0009-2541(02)00131-6
language
English
LU publication?
yes
id
e7b5cfff-3ae6-4ee6-9be2-f5b58e0e81bf (old id 328614)
date added to LUP
2007-11-09 15:52:06
date last changed
2017-01-01 04:31:01
@article{e7b5cfff-3ae6-4ee6-9be2-f5b58e0e81bf,
  abstract     = {Water column (dissolved/suspended phase, sediment traps) and sediment data (pore-water, solid-phase sediment) were combined with stable Pb and Pb-210 isotope data to trace the early diagenetic behaviour and geochemical cycling of Pb in Lake Laisan, a lake which has received large quantities of anthropogenic Pb since the early 1940s. Early diagenetic remobilisation of Pb is indicated by a subsurface pore-water Pb maximum (120 mug 1(-1)) in the oxic surface layer of the sediment, where the solid-phase Pb concentration is 3400-4600 mug g(-1). The remobilisation of Pb appears to be caused by a pH-controlled desorption of Pb from solid-phase sediment, which is consistent with a model describing surface complexation of Pb(II) on hydrous goethite surfaces. The diffusive Pb flux from the subsurface pore-water maximum towards the sediment surface (36 mug cm(-2) year(-1)) exceeds the depositional Pb flux (8.6 mug cm(-2) year(-1)) by approximately a factor of four, indicating that Pb is highly mobile in the sediment. Stable Pb isotope data and a mass balance calculation suggest that Pb diffusing upwards is, to a large extent, trapped in the surface sediment. Lead that may diffuse into the slightly alkaline lake water appears to be efficiently sorbed to suspended particulate matter, resulting in low dissolved Pb concentrations in the water column (0.040-0.046 mug 1(-1)). Sorption of Pb to suspended particulate matter is consistent with the elevated suspended particulate Pb concentrations in the hypolimnion (3800-4000 mug g(-1)), and the fact that the stable Pb isotopic compositions of suspended matter and pore-water are similar.},
  author       = {Widerlund, A and Roos, Per and Gunneriusson, L and Ingri, J and Holmstrom, H},
  issn         = {0009-2541},
  keyword      = {pore-water,early diagenesis,lead isotopes,Lake Laisan,Laisvall},
  language     = {eng},
  number       = {3-4},
  pages        = {183--197},
  publisher    = {Elsevier},
  series       = {Chemical Geology},
  title        = {Early diagenesis and isotopic composition of lead in Lake Laisan, northern Sweden},
  url          = {http://dx.doi.org/10.1016/S0009-2541(02)00131-6},
  volume       = {189},
  year         = {2002},
}