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Open Access Green as soon as Postprint is submitted to ZB.
Retention behavior of hydrophobic organic chemicals as a function of temperature in soil leaching column chromatography.
Chemosphere 49, 569-574 (2002)
To study the transport mechanism of hydrophobic organic chemicals (HOCs) and the energy change in soil/solvent system, a soil leaching column chromatographic (SLCC) experiment at an environmental temperature range of 20-40 degreesC was carried out, which utilized a reference soil (SP 14696) packed column and a methanol-water (1:4 by volume ratio) eluent. The transport process quickens with the increase of column temperature. The ratio of retention factors at 30 and 40 degreesC (k'(30)/k'(40)) ranged from 1.08 to 1.36. The lower enthalpy change of the solute transfer in SLCC (from eluent to soil) than in conventional reversed-phase liquid chromatography (e.g., from eluent to C-18) is consistent with the hypothesis that HOCs were dominantly and physically partitioned between solvent and soil. The results were also verified by the linear solvation energy relationships analysis. The chief factor controlling the retention was found to be the solute solvophobic partition, and the second important factor was the solute hydrogen-bond basicity, while the least important factors were the solute polarizability-dipolarity and hydrogen-bond acidity. With the increase of temperature, the contributions of the solute solvophobic partition and hydrogen-bond basicity gradually decrease, and the latter decreases faster than the former.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Soil leaching column chromatography; Retention factor; Temperature; Enthalpy; Linear solvation energy relationships
ISSN (print) / ISBN
0045-6535
e-ISSN
1879-1298
Journal
Chemosphere
Quellenangaben
Volume: 49,
Issue: 6,
Pages: 569-574
Publisher
Elsevier
Publishing Place
Kidlington, Oxford
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Ecological Chemistry (IOEC)