Terrestrial environment

Effects of temperature and surfactants on naphthalene and phenanthrenesorption by soil

ZHANG Jinghuan , ZENG Jianhui , HE Mengchang


Received April 01, 2008,Revised October 22, 2008, Accepted , Available online

Volume 21,2009,Pages 667-674

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Adsorption experiments were carried out to investigate the sorption behaviors of naphthalene and phenanthrene in six di erent soils and to determine the e ects of temperature, linear alkylbenzene sulfonate (LAS) and cetylrimethyl ammonium bromide (CTAB) on sorption. The results show that for a given sorbent phenanthrene exhibited greater nonlinear and stronger sorption than naphthalene. There was a strong negative correlation for the Koc values with organic carbon content ( foc). The increase of temperature was not favorable to sorption. Sorption decreased along with the increasing aqueous LAS concentration from 0 to 1000 mg/L. At low CTAB concentration (< 100 mg/L), the adsorption increased as CTAB hemimicelles formed on the soil surface. At high concentration, CTAB decreased the adsorption by occupying active hydrophobic adsorption sites and solubilization of naphthalene and phenanthrene.

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