Partition behavior of polycyclic aromatic hydrocarbons between aged coal tar and water

Environmental Toxicology and Chemistry
Lihua LiuTorsten C Schmidt

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 100 degrees C 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 enthalpi...Continue Reading

Citations

Mar 7, 2014·Journal of Contaminant Hydrology·Greg LekmineGreg B Davis
Jan 3, 2012·Journal of Hazardous Materials·Vijay M VulavaGary S Sayler
Aug 30, 2011·Journal of Contaminant Hydrology·P Schultz BirakC T Miller
May 2, 2013·Environmental Pollution·Markus WehrerKai Uwe Totsche
Oct 17, 2016·The Science of the Total Environment·Vijay M VulavaGary S Sayler
Nov 19, 2018·Environmental Science and Pollution Research International·Marine BoulangéPierre Faure

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