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Determining the chemical activity of hydrophobic organic compounds in soil using polymer coated vials

Reichenberg, Fredrik LU ; Smedes, Foppe; Jönsson, Jan Åke LU and Mayer, Philipp (2008) In Chemistry Central Journal 2.
Abstract
Background: In soils contaminated by hydrophobic organic compounds, the concentrations are less indicative of potential exposure and distribution than are the associated chemical activities, fugacities and freely dissolved concentrations. The latter can be measured by diffusive sampling into thin layers of polymer, as in, for example, solid phase micro-extraction. Such measurements require equilibrium partitioning of analytes into the polymer while ensuring that the sample is not depleted. We introduce the validation of these requirements based on parallel sampling into polymer layers of different thicknesses. Results: Equilibrium sampling devices were made by coating glass vials internally with 3-12 mu m thick layers of... (More)
Background: In soils contaminated by hydrophobic organic compounds, the concentrations are less indicative of potential exposure and distribution than are the associated chemical activities, fugacities and freely dissolved concentrations. The latter can be measured by diffusive sampling into thin layers of polymer, as in, for example, solid phase micro-extraction. Such measurements require equilibrium partitioning of analytes into the polymer while ensuring that the sample is not depleted. We introduce the validation of these requirements based on parallel sampling into polymer layers of different thicknesses. Results: Equilibrium sampling devices were made by coating glass vials internally with 3-12 mu m thick layers of polydimethylsiloxane (PDMS). These were filled with slurries of a polluted soil and gently agitated for 5 days. The concentrations of 7 polycyclic aromatic hydrocarbons (PAHs) in the PDMS were measured. Validation confirmed fulfilment of the equilibrium sampling requirements and high measurement precision. Finally, chemical activities of the PAHs in the soil were determined from their concentrations and activity coefficients in the PDMS. Conclusion: PAHs' thermodynamic activities in a soil test material were determined via a method of uptake into PDMS. This can be used to assess chemical exposure and predict diffusion and partitioning processes. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
Chemistry Central Journal
volume
2
publisher
BioMed Central
external identifiers
  • wos:000259066300001
  • scopus:44649169700
ISSN
1752-153X
DOI
10.1186/1752-153X-2-8
language
English
LU publication?
yes
id
9c5e7ceb-e5b5-499c-99ec-16e933570ae3 (old id 1247019)
date added to LUP
2008-11-17 11:37:40
date last changed
2017-09-03 04:05:43
@article{9c5e7ceb-e5b5-499c-99ec-16e933570ae3,
  abstract     = {Background: In soils contaminated by hydrophobic organic compounds, the concentrations are less indicative of potential exposure and distribution than are the associated chemical activities, fugacities and freely dissolved concentrations. The latter can be measured by diffusive sampling into thin layers of polymer, as in, for example, solid phase micro-extraction. Such measurements require equilibrium partitioning of analytes into the polymer while ensuring that the sample is not depleted. We introduce the validation of these requirements based on parallel sampling into polymer layers of different thicknesses. Results: Equilibrium sampling devices were made by coating glass vials internally with 3-12 mu m thick layers of polydimethylsiloxane (PDMS). These were filled with slurries of a polluted soil and gently agitated for 5 days. The concentrations of 7 polycyclic aromatic hydrocarbons (PAHs) in the PDMS were measured. Validation confirmed fulfilment of the equilibrium sampling requirements and high measurement precision. Finally, chemical activities of the PAHs in the soil were determined from their concentrations and activity coefficients in the PDMS. Conclusion: PAHs' thermodynamic activities in a soil test material were determined via a method of uptake into PDMS. This can be used to assess chemical exposure and predict diffusion and partitioning processes.},
  author       = {Reichenberg, Fredrik and Smedes, Foppe and Jönsson, Jan Åke and Mayer, Philipp},
  issn         = {1752-153X},
  language     = {eng},
  publisher    = {BioMed Central},
  series       = {Chemistry Central Journal},
  title        = {Determining the chemical activity of hydrophobic organic compounds in soil using polymer coated vials},
  url          = {http://dx.doi.org/10.1186/1752-153X-2-8},
  volume       = {2},
  year         = {2008},
}