Adsorption and Desorption Behaviors of Nitrobenzene and Aniline by Wetland Soil

Batch equilibrium experiments were performed to assess adsorption and desorption characteristics of nitrobenzene and aniline by wetland soil. The results showed that wetland soil had strong adsorption capability for nitrobenzene and aniline, adsorption and desorption of nitrobenzene and aniline by different types of wetland soil were different. The linear and Fruendlich model were fit for describing the adsorption behavior. Adsorption coefficient (Kf) of nitrobenzene or aniline and soil organic matter (SOM) content were significant positively correlated (R²=0.789, p<;0.01 for nitrobenzene and R²=0.953 p<;0.01 for aniline ). The 0~10 cm peat mire soil had the maximum adsorption coefficient (86.44 mg/kg for nitrobenzene and 42.67 mg/kg for aniline), which had the highest SOM content, it is indicated that sorption mechanisms of nitrobenzene and aniline include hydrophobic portioning characteristics. The meadow lessive soil absorbed minimum and desorbed maximum both for nitrobenzene and aniline.