【摘要】 采用批量平衡实验,研究了氯苯、1,4-二氯苯、1,2,4-三氯苯和1,2,4,5-四氯苯4种氯苯类化合物(CBs)在含不同特性的自然有机质(NOM)的5种沉积物上的吸附-解吸行为。研究结果表明,所有吸附等温线均表现出明显的非线性和吸附-解吸滞后现象。1,2,4-三氯苯在不同沉积物上吸附等温线的非线性程度以及在沉积物上解吸滞后效应都随着沉积物NOM聚合度的增加而增大。另外,CBs溶质分子本身的性质也影响着其在沉积物上的吸附-解吸性能。4种CBs在同一种沉积物上吸附等温线的非线性程度及其解吸滞后系数按氯苯、1,4-二氯苯、1,2,4-三氯苯、1,2,4,5-四氯苯的顺序依次减弱,说明CBs的分子尺寸越大,其在沉积物上的吸附非线性程度和解吸滞后现象也越弱。更多还原

【Abstract】 Batch technique experiments were conducted to study the sorption and desorption behavior of chlorobenzene,1,4-dichlorobenzene,1,2,4-trichlorobenzene and 1,2,4,5-tetrachlorobenzene on 5 sediments with different natural organic matter(NOM)characteristics.The results showed that the sorption-desorption isotherms of 4 CBs from water on several sediments with various NOM properties exhibited distinct nonlinearity and sorption-desorption hysteresis.The sorption nonlinearity and hysteresis index of 1,2,4-trichlorobenzene increased with the increase of the degree of sediment NOM condensation.In addition,the CBs properties themselves influenced the sorption-desorption behavior.The smaller the CBs molecule is,the more significant the sorption nonlinearity and sorption-desorption hysteresis are.更多还原