title: The feasibility of enhanced soil washing of p-nitrochlorobenzene (pNCB) with SDBS/Tween80 mixed surfactants.
abstract: The present study investigated the feasibility of using two mixed surfactants, anionic surfactant sodium dodecylbenzenesulfonate (SDBS) and nonionic surfactant polysorbate 80 (Tween80), for the remediation of p-nitrochlorobenzene (pNCB) contaminated soil. The water solubility, the apparent soil-water distribution constant (K(d)(*)) and the desorption ratio of pNCB, as well as the sorption of surfactants by the soil were significantly affected by the dosage of surfactants and the mass ratio of SDBS/Tween80. Because of the formation of mixed micelles, the presence of SDBS showed more effective than individual Tween80 for increasing the water solubility, decreasing the K(d)(*) and enhancing the desorption ratio of pNCB, as well as inhibiting the sorption of surfactants by the soil. Low dosage of surfactants (Tween80 < 2000 mg L(-1)) increased the K(d)(*) value and inhibited the desorption of pNCB from soil. However, relative high concentration of Tween80 had positive effect on the decrease of the K(d)(*) value and increase of pNCB desorption. In addition, among the tested surfactant systems, mixed SDBS/Tween80 with a 1:1 mass ratio exhibited the highest pNCB desorption. The results indicated that it is feasible to use mixed SDBS/Tween80 surfactants for the remediation of pNCB contaminated soil.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Hankou Road, No. 22, Nanjing 210093, PR China.
authors.forename: Huiqin
authors.initials: H
authors.lastname: Guo
authors.forename: Zhenyu
authors.initials: Z
authors.lastname: Liu
authors.forename: Shaogui
authors.initials: S
authors.lastname: Yang
authors.forename: Cheng
authors.initials: C
authors.lastname: Sun
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D009578:Nitrobenzenes / Q000737:chemistry*; D011136:Polysorbates / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*; D012995:Solubility; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D001557:Benzenesulfonates; D007202:Indicators and Reagents; D009578:Nitrobenzenes; D011136:Polysorbates; D012989:Soil Pollutants; D013501:Surface-Active Agents; D014867:Water; C001114:dodecylbenzenesulfonic acid; C010407:4-chloronitrobenzene