作　　者： ;

机构地区： 广州大学环境科学与工程学院环境科学系

出　　处： 《中国环境科学》 2003年第4期371-375,共5页

摘　　要： 采用完全混合一步平衡反应实验方法,选择三氯苯和二甲苯作为HOCs的探针,研究它们在土壤以及从土壤中分离出的胡敏酸、胡敏素等土壤有机质(SOMs)中的等温平衡吸附行为,探讨非线性吸附的机制.结果表明,憎水有机物(HOCs)在水、土壤体系中的吸附行为主要受到SOMs的控制,松散的胡敏酸表现出相对线性的吸附行为(n=0.845～0.867),而聚集的胡敏素和'黑炭'组分则表现出非线性吸附(n=0.634～0.860),并具有很强的亲和性(logKF=0.109～1.321). HOCs在土壤中的非线性吸附主要是它们在聚结的土壤有机质表面吸附的结果. In order to provide a insight into the mechanisms of nonlinearity sorption, 1,3,5-trichlorobezene (TCB) and o-xylene were selected as solute probes of the hydrophobic organic compounds (HOCs). Completely batch sorption experiments were employed to study the sorption equilibriums of HOCs in a mineral soil, its humic acid and humin fractions. The sorption of HOCs in soil are primarily regulated by soil organic matters (SOMs). Expanded humic acid exhibits relative linear isotherms in all sorts of sorbent (n=0.845~0.867), while condensed humin and 揵lack carbon?exhibits nonlinear isotherms (n=0.634~0.860). Isotherms nonlinearity increased in the following order: Humin acid < soil < humin. Of the samples, humin and black carbon exhibited the highest sorption capacity for TCB and o-xylene. The HOCs sorption nonlinearity is likely to contribute to their adsorption on humin and black carbon.

关 键 词： 憎水有机物 土壤有机质 吸附

领　　域： [环境科学与工程]