为客观评价乙醇对不同形态土壤有机质吸附汽油污染物的影响,本文通过序批实验研究了乙醇影响下苯和甲苯在腐殖酸和黑炭上的吸附,结果表明,腐殖酸以“软碳”为主,苯和甲苯在其上的吸附表现为线性分配,而黑炭以“硬碳”为主,苯和甲苯在其上的吸附为非线性吸附;苯和甲苯在黑炭上的吸附能力要比在腐殖酸上的吸附能力高一至两个数量级.乙醇具有共溶剂效应,随着溶液中乙醇体积分数(fc)的增加,苯和甲苯的溶解度呈线性增加,在有机质上的吸附能力则逐渐减弱.此外,通过共溶剂模型以及对溶液浓度标准化(Ce/Sw)后的数据进行分析,推断乙醇还可能使有机质结构发生了一定程度的溶胀.
In order to assess the influence of ethanol on the adsorption of gasoline components on different soil organic matter forms,batch experiments were carried out to investigate the adsorption of benzene and toluene on humic acid and black carbon.The results showed that humic acid is mainly made up of "soft carbon",where sorption followed a linear partitioning process.Black carbon is mainly made up of "hard carbon",where sorption exhibited n onlinear surface adsorption.The adsorption capacity of benzene and toluene on black carbon was one to two orders of magnitude higher than that on humic acid.As the volume fraction of ethanol (fc) increased,solubility of benzene and toluene increased linearly,whereas their adsorption capacity decreased.After the normalization of Ce by solubility (Sw),the data show ethanol may swell the soil organic matter,which is consistent with the cosolvent model.
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