Desorption kinetics studies on PAH-contaminated soil under varying temperatures
Författare
Summary, in English
The purpose of this study was to investigate the effect of temperature on the release of polycyclic aromatic hydrocarbons (PAHs) from aged contaminated soil. The release of fluorene, phenanthrene, anthracene, fluoranthene and pyrene at 7, 15, 18 and 23 °C was studied using a column leaching method with a hydraulic retention time of 0.5 h. As the temperature declined from 23 to 7 °C the concentrations decreased by a factor of 11–12 for all the studied compounds except for anthracene, which only decreased by a factor 7. Rate constants at maximum release rate at the four studied temperatures were assessed. From temperature dependence studies, apparent activation energies of desorption, , were calculated. -values appeared to be in the range of 105–137 kJ mol−1 for the studied PAHs and increased with the LeBas molar volume of the compounds. The increase of with increased molecular size indicates stronger sorption with increased hydrophobicity of the compounds.
Publiceringsår
2005
Språk
Engelska
Sidor
1529-1538
Publikation/Tidskrift/Serie
Chemosphere
Volym
61
Issue
10
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Elsevier
Ämne
- Environmental Sciences
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 1879-1298