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Chiral signatures of chlordanes indicate changing sources to the atmosphere over the past 30 years

Bidleman, TF; Wong, F; Backe, Cecilia LU ; Södergren, Anders LU ; Brorström-Lunden, E; Helm, PA and Stern, GA (2004) In Atmospheric Environment 38(35). p.5963-5970
Abstract
Chlordane was used as an insecticide for half a century until its withdrawal from the world market in 1997. Trans- and cis-chlordane (TC, CC) are racemic in the technical product, but undergo enantio selective degradation in soil to leave nonracemic residues. In most cases, the (+) enantiomer of TC and the (-) enantiomer of CC are depleted, leading to enantiomer fractions, EF = (+)/[(+) + (-)], that are < 0.500 for TC and > 0.500 for CC. Nonracemic EFs of TC and CC, showing the same degradation preference as soils, were found in 1998-2001 air samples from stations in Arctic Canada and Finland, and on the west coast of Sweden. Environmental samples representing different time periods of chlordane history were also examined in: (a)... (More)
Chlordane was used as an insecticide for half a century until its withdrawal from the world market in 1997. Trans- and cis-chlordane (TC, CC) are racemic in the technical product, but undergo enantio selective degradation in soil to leave nonracemic residues. In most cases, the (+) enantiomer of TC and the (-) enantiomer of CC are depleted, leading to enantiomer fractions, EF = (+)/[(+) + (-)], that are < 0.500 for TC and > 0.500 for CC. Nonracemic EFs of TC and CC, showing the same degradation preference as soils, were found in 1998-2001 air samples from stations in Arctic Canada and Finland, and on the west coast of Sweden. Environmental samples representing different time periods of chlordane history were also examined in: (a) archived atmospheric deposition samples collected in Sweden, Slovakia and Iceland in 1971-1973, (b) soils from southern Sweden sampled in 2001 and (c) a laminated lake sediment core from the Canadian Arctic representing similar to50 years of accumulation. TC and CC were racemic or nearly so in the historical atmospheric deposition samples and nonracemic in the Swedish soils. The EF of TC in the dated take sediment core decreased from nearly racemic in the past to nonracemic in recent times. These observations suggest that sources of chlordane to the atmosphere have changed over time and are now influenced to a greater extent by emission from soils. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Atmospheric Environment
volume
38
issue
35
pages
5963 - 5970
publisher
Elsevier
external identifiers
  • wos:000224654100008
  • scopus:4744367447
ISSN
1352-2310
DOI
10.1016/j.atmosenv.2004.07.005
language
English
LU publication?
yes
id
b241be82-2e33-4874-819e-71faae1107bd (old id 135791)
date added to LUP
2007-06-27 09:09:28
date last changed
2017-02-26 04:10:55
@article{b241be82-2e33-4874-819e-71faae1107bd,
  abstract     = {Chlordane was used as an insecticide for half a century until its withdrawal from the world market in 1997. Trans- and cis-chlordane (TC, CC) are racemic in the technical product, but undergo enantio selective degradation in soil to leave nonracemic residues. In most cases, the (+) enantiomer of TC and the (-) enantiomer of CC are depleted, leading to enantiomer fractions, EF = (+)/[(+) + (-)], that are &lt; 0.500 for TC and &gt; 0.500 for CC. Nonracemic EFs of TC and CC, showing the same degradation preference as soils, were found in 1998-2001 air samples from stations in Arctic Canada and Finland, and on the west coast of Sweden. Environmental samples representing different time periods of chlordane history were also examined in: (a) archived atmospheric deposition samples collected in Sweden, Slovakia and Iceland in 1971-1973, (b) soils from southern Sweden sampled in 2001 and (c) a laminated lake sediment core from the Canadian Arctic representing similar to50 years of accumulation. TC and CC were racemic or nearly so in the historical atmospheric deposition samples and nonracemic in the Swedish soils. The EF of TC in the dated take sediment core decreased from nearly racemic in the past to nonracemic in recent times. These observations suggest that sources of chlordane to the atmosphere have changed over time and are now influenced to a greater extent by emission from soils.},
  author       = {Bidleman, TF and Wong, F and Backe, Cecilia and Södergren, Anders and Brorström-Lunden, E and Helm, PA and Stern, GA},
  issn         = {1352-2310},
  language     = {eng},
  number       = {35},
  pages        = {5963--5970},
  publisher    = {Elsevier},
  series       = {Atmospheric Environment},
  title        = {Chiral signatures of chlordanes indicate changing sources to the atmosphere over the past 30 years},
  url          = {http://dx.doi.org/10.1016/j.atmosenv.2004.07.005},
  volume       = {38},
  year         = {2004},
}