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Radiolead (210Pb) and stable lead in the lichen Cladonia alpestris

Persson, B. R.R. LU orcid ; Liden, K. and Holm, Elis LU (1974) In Oikos 25(2). p.140-147
Abstract

Lichens of the genus Cladonia, mainly C. alpestris, collected during 1882-1972 were analyzed for stable lead and 210Pb. The specific activity of 210Pb (210Pb/Pb ratio) indicates a constant value of about 2 mCi/kg up to 1940, and then decreased to 0.6 mCi/kg during 1950-1960. As the average annual 210Pb deposition is relatively constant, the decrease in the 210Pb/Pb ratio after 1940 indicates an increased deposition of stable lead after 1940. A single exponential variation of the 210Pb/Pb ratio, in respect to latitude, was found in lichens collected in 1964. Values for 210Pb and stable lead in C. alpestris, collected in central Sweden during 1961-1972, appear to... (More)

Lichens of the genus Cladonia, mainly C. alpestris, collected during 1882-1972 were analyzed for stable lead and 210Pb. The specific activity of 210Pb (210Pb/Pb ratio) indicates a constant value of about 2 mCi/kg up to 1940, and then decreased to 0.6 mCi/kg during 1950-1960. As the average annual 210Pb deposition is relatively constant, the decrease in the 210Pb/Pb ratio after 1940 indicates an increased deposition of stable lead after 1940. A single exponential variation of the 210Pb/Pb ratio, in respect to latitude, was found in lichens collected in 1964. Values for 210Pb and stable lead in C. alpestris, collected in central Sweden during 1961-1972, appear to be relatively constant and the average area content of 210Pb and stable lead in lichen carpets was 15 ± 2 nCi/m2 and 25 ± 5 mg/m2 respectively. The pattern of vertical distribution was converted to a model for the translocation of lead in lichens, which included the diffusion principle. The diffusion coefficient for lead in the top layer of the lichen carpet was estimated to be about (0.2 ± 0.1) x 10-6 cm2 x s-1.

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author
; and
organization
publishing date
type
Contribution to journal
publication status
published
in
Oikos
volume
25
issue
2
pages
8 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:0016230595
ISSN
0030-1299
DOI
10.2307/3543635
language
English
LU publication?
yes
id
7f21482e-e57a-4d96-8af1-e01c5420f0b8
date added to LUP
2020-08-30 21:11:59
date last changed
2021-01-04 11:04:27
@article{7f21482e-e57a-4d96-8af1-e01c5420f0b8,
  abstract     = {{<p>Lichens of the genus Cladonia, mainly C. alpestris, collected during 1882-1972 were analyzed for stable lead and <sup>210</sup>Pb. The specific activity of <sup>210</sup>Pb (<sup>210</sup>Pb/Pb ratio) indicates a constant value of about 2 mCi/kg up to 1940, and then decreased to 0.6 mCi/kg during 1950-1960. As the average annual <sup>210</sup>Pb deposition is relatively constant, the decrease in the <sup>210</sup>Pb/Pb ratio after 1940 indicates an increased deposition of stable lead after 1940. A single exponential variation of the <sup>210</sup>Pb/Pb ratio, in respect to latitude, was found in lichens collected in 1964. Values for <sup>210</sup>Pb and stable lead in C. alpestris, collected in central Sweden during 1961-1972, appear to be relatively constant and the average area content of <sup>210</sup>Pb and stable lead in lichen carpets was 15 ± 2 nCi/m<sup>2</sup> and 25 ± 5 mg/m<sup>2</sup> respectively. The pattern of vertical distribution was converted to a model for the translocation of lead in lichens, which included the diffusion principle. The diffusion coefficient for lead in the top layer of the lichen carpet was estimated to be about (0.2 ± 0.1) x 10-<sup>6</sup> cm<sup>2</sup> x s-<sup>1</sup>.</p>}},
  author       = {{Persson, B. R.R. and Liden, K. and Holm, Elis}},
  issn         = {{0030-1299}},
  language     = {{eng}},
  month        = {{01}},
  number       = {{2}},
  pages        = {{140--147}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Oikos}},
  title        = {{Radiolead (<sup>210</sup>Pb) and stable lead in the lichen Cladonia alpestris}},
  url          = {{http://dx.doi.org/10.2307/3543635}},
  doi          = {{10.2307/3543635}},
  volume       = {{25}},
  year         = {{1974}},
}