Environmental Pollution, April, 2013, Vol.175, p.110(7)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.envpol.2012.12.027 Byline: Guohui Wang, Peter Grathwohl Abstract: Isosteric heats ([DELTA]H) of sorption/desorption of phenanthrene were determined for carbonaceous materials (Pahokee peat, lignite, and high-volatile bituminous coal) and two soils based on reported equilibrium sorption/desorption isotherms at four different temperatures (4, 20, 46 and 77 [degrees]C). In addition, [DELTA]H for desorption of native phenanthrene was determined to elucidate the "aging" effect by equilibrating samples with water at six temperatures (20, 40, 53, 61, 73, and 86 [degrees]C). Isosteric heats decreased with increasing solute concentration and were in a range of 19-35 kJ mol.sup.-1. Values higher than the heat of octanol-water phase transfer for phenanthrene (19 kJ mol.sup.-1) imply that both partitioning and adsorption processes are involved for these materials, where the sorptive contributions from both processes were estimated based on the phenanthrene thermodynamic data. Moreover, on the basis of [DELTA]H values of desorption, release of native and spiked phenanthrene from our samples was similar. Author Affiliation: Center for Applied Geoscience, University Tubingen, Holderlinstr. 12, D-72074 Tubingen, Germany Article History: Received 26 June 2012; Revised 20 December 2012; Accepted 21 December 2012
Bituminous Coal ; Soils ; Adsorption ; Lignite ; Peat
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