Effect of temperature on the distribution of polycyclic aromatic hydrocarbons in soil and sediment

• DOI: 10.17221/28/2008-swr
• Publication Date: 2018-02-11T02:33:37Z
• Authors: Edgar Hiller; Ľubomír Jurkovič; Mikuláš Bartaľ
• Keywords: Polycyclic aromatic hydrocarbon

The knowledge of sorption-desorption processes polycyclic aromatic hydrocarbons (PAHs) in natural solids is essential to predict the fate, transport, and environmental risks these pollutants. In this study, effect was investigated temperature on three PAHs (naphthalene, phenanthrene, pyrene) two with different organic carbon contents. all cases, sorption isotherms obtained could be well described by linear model. analysis based measured corresponding equilibrium partition coefficients (Kp) revealed that (1) increased content solid PAH hydrophobicity order: sediment < soil naphthalene phenanthrene pyrene, respectively, (2) extent decreased increasing from 4°C 27°C average 27.3, 17.0, 27.4% for naphthalene, respectively. enthalpies (δHs) calculated van't Hoff equation were negative, relatively small, range weak forces such as van der Waals (0-9 kJ/mol), consistent hydrophobic interactions partitioning into soil/sediment matter. desorption showed significant hysteresis, i.e. great fraction resistant somewhat temperature.