外源添加物对土壤吸附邻苯二甲酸二甲酯的影响

Effect of Exogenous Additives Addition on Adsorption of Dimethyl Phthalate in Soil

采用批处理恒温振荡法,利用高效液相色谱研究了生物炭、人工沸石、壳聚糖三种外源添加物对土壤吸附邻苯二甲酸二甲酯的影响。结果表明,添加生物炭土壤对邻苯二甲酸二甲酯的吸附量明显高于对照土壤,而且随土壤中生物炭添加量的增加,吸附量显著增大,而添加人工沸石和壳聚糖使土壤对邻苯二甲酸二甲酯的吸附能力略有提高。Langmuir和Freundlich方程都能够较好地描述对照土壤和添加外源物土壤对邻苯二甲酸二甲酯的吸附,相关系数介于0.9627～0.9899之间。在相同的平衡浓度条件下,添加生物炭可以明显提高土壤对邻苯二甲酸二甲酯的吸附量,而人工沸石和壳聚糖的作用相对较小。

The batch constant temperatu re oscillation is used to research the impact on adsorption of dimethyl phthalate through adding bio-char, artificialzeolite and chitosan into soil. The results show that the adsorption capacity of dimethyl phthalate by soil with bio-char is obviously higher than reference soil. With the increase of bio-char addition, the adsorption capacity of dimethyl phthalate is obviously increased. There is no obvious improvement of adsorption capacity of dimethyl phthalate by soil with artificialzeolite and chitosan. Langmuir and Freundlich equation are suited to describe adsorption characteristics of dimethyl phthalate by reference soil and soil with exogenous additives, with high correlation coefficient of 0.9627 - 0.9899. Under the same condition of equilibrium concentration, the adsorption of dimethyl phthalate is improved obviously by adding bio-char into soil, but the effects of artifieialzeolite and chitosan are weak.