土壤对可溶性油的吸附作用及其影响因素分析

在沈(阳) 抚(顺) 灌区土-水-作物系统石油污染调查的基础上, 根据土壤非饱和带的结构和组成, 选择代表性的土壤剖面分别采集表土和底土, 分析土样的主要物理和化学性质, 系统测定不同土样对可溶性油吸附的动力学曲线和吸附等温线, 并分析了有机质、粘粒含量和含盐量对吸附作用的影响.结果表明, 土壤对可溶性油的吸附平衡时间为20~24h, 而且不同土样的吸附等温线均为直线型理想吸附.另外, 通过试验发现, 当水相中可溶性油低于一定浓度时, 不但不产生吸附, 反而使土壤中的残留油分释放出来. 

Adsorption of Aqueous Oil on Soils and Its Analysis of Effective Factors

On the basis of the investigation into the oil contamination of soil-water-plant systems in the Shenyang-Fushun irrigation field, surface soils and bottom soils were sampled along 3 representative profiles and their major physical and chemical properties were analyzed. Kinetic curves and isotherms of aqueous oil adsorption on soils were measured and influence of organic matter, clay particle and salt contents on the adsorption was evaluated. The research results show that the equilibrium period of the adsorption is 20-24 hours, and all the adsorption isotherms are straight. In addition, it was found that the soils release some oil when the aqueous oil concentrations are lower than certain values.