Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1897/08-276.1
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Title (Primary) Partition behavior of polycyclic aromatic hydrocarbons between aged coal tar and water
Author Liu, L.; Endo, S.; Eberhardt, C.; Grathwohl, P.; Schmidt, T.C.
Source Titel Environmental Toxicology and Chemistry
Year 2009
Department AUC
Volume 28
Issue 8
Page From 1578
Page To 1584
Language englisch
Supplements https://setac.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1897%2F08-276.1&file=10.1897_08-276.S1.pdf
Keywords Aging coal tar; Polycyclic aromatic hydrocarbons; Solidification; Raoult's law; Dissolution enthalpies
Abstract Coal tar aged in a large-scale, artificial aquifer experiment for five years was subsequently investigated for leaching behavior of polycyclic aromatic hydrocarbons (PAHs). After five years, the initially liquid coal tar had solidified and formed segregated particles with a grain size similar to that of the sandy aquifer material. The composition of the aged coal tar (ACT) with regard to PAHs was remarkably different from that of the original bulk coal tar (BCT), because most of the low-molecular-weight compounds had been depleted. Equilibrium aqueous-phase concentrations of 17 PAHs leaching from the aquifer material containing the ACT were measured from consecutive equilibration steps at increasing temperatures of between 25 and 100C using accelerated solvent extraction. The results showed 2-to 5,000-fold lower concentrations than those from BCT, indicating dramatic changes of dissolution behavior of PAHs from coal tar after the five-year aging period. Predictions based on Raoult's law with the subcooled liquid solubilities substantially overestimated the equilibrium aqueous-phase concentrations of the PAHs from ACT, whereas the estimations were reasonable if the solid solubilities were employed instead. The enthalpies of phase transfer from ACT to water were determined based on the van't Hoff equation. The resulting values agreed with the dissolution enthalpies of pure solid rather than subcooled liquid PAHs.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=10262
Liu, L., Endo, S., Eberhardt, C., Grathwohl, P., Schmidt, T.C. (2009):
Partition behavior of polycyclic aromatic hydrocarbons between aged coal tar and water
Environ. Toxicol. Chem. 28 (8), 1578 - 1584 10.1897/08-276.1