【摘要】：可移動的土壤膠體是地下環(huán)境中較為活躍的成分,其對污染物的運(yùn)移具有易化作用。研究其易化運(yùn)移規(guī)律,可以為污染場地風(fēng)險(xiǎn)評價(jià)及修復(fù)提供理論依據(jù)和技術(shù)支撐。本文選取我國具有代表性的三種土壤(黑土、潮土、紅壤)提取膠體并對其主要理化性質(zhì)進(jìn)行表征,通過膠體在土柱中的淋溶實(shí)驗(yàn)研究膠體運(yùn)移特征以及不同影響因素(pH、IS)下膠體的運(yùn)移規(guī)律,并研究其對菲在土柱中運(yùn)移的易化作用。結(jié)果顯示,所提膠體粒徑90%以上分布在1μm以下；三種膠體所含的礦物質(zhì)種類與含量上有所差異；不同膠體所含的化學(xué)基團(tuán)種類相似,但含量有所差異。淋濾溶液的pH和離子強(qiáng)度(IS)對膠體運(yùn)移產(chǎn)生明顯的影響。以黑土膠體為例,當(dāng)pH由4增加到9時(shí),k值由6.020×10~(-4)降低至3.858×10~(-4),Ca~(2+)、K~+、Na~+當(dāng)離子強(qiáng)度由0.5mmol/L變化到0.001mmol/L時(shí),k值分別由6.087×10~(-4)降低至4.024×10~(-4)、5.518×10~(-4)降低至3.818×10~(-4)、5.401×10~(-4)降低至4.109×10~(-4)。pH和IS對不同種類膠體影響趨勢相同,但影響程度上有所差異。pH對土壤膠體運(yùn)移影響大小排序：黑土紅壤潮土。IS對土壤膠體運(yùn)移影響大小排序：紅壤黑土潮土。三種土壤膠體對菲在土柱中運(yùn)移均具有易化作用,易化程度上大小排序：潮土紅壤黑土。
[Abstract]:Mobile soil colloid is an active component in underground environment, which facilitates the transport of pollutants. The study of its facilitation migration law can provide theoretical basis and technical support for risk assessment and remediation of contaminated sites. In this paper, three representative soils (black soil, tidal soil, red soil) were selected to extract colloids and their main physical and chemical properties were characterized. The characteristics of colloid migration and the law of colloid migration under different influencing factors (pH,IS) were studied by means of colloid leaching experiments in soil column, and the facilitation of phenanthrene migration in soil column was studied. The results showed that the size of the colloid was above 90% and the mineral content of the three kinds of colloids was different, and the kinds of chemical groups in different colloids were similar, but the contents of the three kinds of colloids were different. The effects of pH and (IS) on colloid migration are obvious. 浠ラ粦鍦熻兌浣撲負(fù)渚，

本文編號：2270793