黑土中不同有机质组分对三氯乙烯吸附特征研究

Study on adsorption characteristics of trichloroethylene with different organic matter components in black soil

文章采用分步提取法制备东北黑土有机质组分,研究不同有机质组分结构与性质,分析差异;运用批量平衡试验方法研究三氯乙烯(TCE)在三种有机质组分中吸附规律。结果表明,土壤中各有机质组分含量有较大差异,为HM>FA>HA,有机质组分中H/C,O/C和(N+O)/C比,为FA>HA>HM,说明FA组分脂肪性最高,极性最强;有机质组分对TCE吸附平衡时间为24 h,胡敏素(HM)对TCE吸附能力高于富里酸(FA)和胡敏酸(HA);试验浓度范围内,三种有机质组分对TCE吸附均符合Freundlich等温吸附曲线,吸附能力为HM>HA>FA。

The organic matter fractions in the black soil of Northeast China were prepared by the stepwise extraction method in this paper, the differences of the structure and properties of different organic matter fractions were studied and the differences were analyzed. The adsorption law of trichloroethylene （TCE） in three organic matter fractions was studied by using batch equilibrium method.The results showed that there were significant differences in the contents of soil organic matter fractions fractions. The order of their size was HM〉FA〉HA, H/C, O/C and （N＋O）/C ratio in the organic matter composition, ie FA〉HA〉 HM, indicating that FA component had the highest fatity and the strongest polarity. The adsorption equilibrium time of the organic matter fractions to TCE was 24 h, and the adsorption capacity of humin matter （HM） on TCE was higher than those of the offulvic acid （FA） and humic acid （HA）. The adsorption of the organic matter fractions on TCE accorded with the Freundlich adsorption isotherm in the experimental concentration range. And the adsorption capacity satisfied HM〉HA〉FA.