土壤胶体对菲在地下环境中的易化运移作用

发布时间：2018-10-14 14:48

【摘要】：可移动的土壤胶体是地下环境中较为活跃的成分,其对污染物的运移具有易化作用。研究其易化运移规律,可以为污染场地风险评价及修复提供理论依据和技术支撑。本文选取我国具有代表性的三种土壤(黑土、潮土、红壤)提取胶体并对其主要理化性质进行表征,通过胶体在土柱中的淋溶实验研究胶体运移特征以及不同影响因素(pH、IS)下胶体的运移规律,并研究其对菲在土柱中运移的易化作用。结果显示,所提胶体粒径90%以上分布在1μm以下；三种胶体所含的矿物质种类与含量上有所差异；不同胶体所含的化学基团种类相似,但含量有所差异。淋滤溶液的pH和离子强度(IS)对胶体运移产生明显的影响。以黑土胶体为例,当pH由4增加到9时,k值由6.020×10~(-4)降低至3.858×10~(-4),Ca~(2+)、K~+、Na~+当离子强度由0.5mmol/L变化到0.001mmol/L时,k值分别由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对不同种类胶体影响趋势相同,但影响程度上有所差异。pH对土壤胶体运移影响大小排序：黑土红壤潮土。IS对土壤胶体运移影响大小排序：红壤黑土潮土。三种土壤胶体对菲在土柱中运移均具有易化作用,易化程度上大小排序：潮土红壤黑土。
[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. 浠ラ粦鍦熻兌浣撲负渚，

本文编号：2270793