Study On Competitive Sorption Of Nitrobenzene Compounds In Soils And Sandy Materials

Competitive sorption of refractory and toxic organic pollutants is one focus of environmental science and engineering research. This dissertation investigates the sorption behavior and mechanism of organic pollutants (2,4-dinitrotoluene, DNT) under the influence of combind pollution (4-nitrotoluene (NT) and nitrobenzene (NB)) to natural soils and aquifer sandy materials with a low percentage of organic carbon. The main conclusions are:(1) Sorption isotherms measured for DNT are clearly nonlinear in single-solute systems, and the sorption by all soils and sandy materials is mainly surface adsorption. (2) The incorporation of NT and NB depresses the sorption amount of DNT by soils and sandy materials and makes the isotherms more linear. (3) The competitiveness of NT and NB follows a sequence:NT> NB in a soil-water system, but the contrary in a sand-water system. In tri-solute systems, it is exhibited that mixture of two cosolutes each of which can suppress sorption of primary solutes onto surface soils has a synergistically competitive effect on sorption of primary solutes.