土壤中有机碳含量对三氯乙烯的吸附影响实验

采用某地区土壤样品,利用批实验的方法,研究不同有机碳含量的土壤样品对三氯乙烯(TCE) 的吸附行为.研究表明,土壤样品中,由于有机碳含量不同,有机污染物三氯乙烯(TEC)的吸附量不同,存在有机碳含量的阈值区间(foc*).最小foc*=0.702%,最大foc*=1.831%,当foc<0.702%时,TCE吸附量随土壤样品的有机碳含量变化较小,基本不随foc变化而发生较大变化;在0.702%1.831%时,TCE吸附量随土壤样品的有机碳含量变化又变得平缓,基本上又不随foc升高而发生较大的变化.

The effects of different contents of organic carbon on the adsorption of trichlorinated hydrocarbon in soil

The adsorption of organic contaminants in soil is one of the most important factors affecting the migration and transformation process of these organic contaminants. Using batch experiments, this paper studied the adsorption behaviors of Trichloroethylene (TCE) in soil samples with different contents of organic carbon. The results indicate that the adsorption capacity is significantly correlated with different contents of organic carbon. There exist critical threshold values (f_∝~*) of organic carbon contents. The minimum f_∝~* and the maximum f_∝~* are equal to 0.702% and 1.831%, respectively. The TCE adsorption capacity does not vary greatly with the increasing of organic carbon contents when f_∝ is lower than 0.702% . Nevertheless, the TCE adsorption capacity varies considerably with the increasing of organic carbon contents when 0.702%