不同下垫面苯系物的挥发行为研究  

Volatilization Behavior of BTEX on Different Underlying Materials

作　　者：童玲[1] 郑西来[1] 李梅[1] 胡志峰[1] 

机构地区：[1]中国海洋芙学海洋环境与生态教育部重点实验室,青岛266100

出　　处：《环境科学》2008年第7期2058-2062,共5页Environmental Science

基　　金：国家自然科学基金项目(40572142);教育部博士点基金项目(20040423016);山东省水利厅专项基金项目(2005)

摘　　要：结合石油化工区挥发性污染物泄漏控制的需要,选取淄博地区代表性的砂土、壤土和水3种下垫面,对苯系物的挥发行为进行试验研究,得到了不同类型下垫面中苯系物单组分及其混合物的挥发动力学曲线、最优拟合公式和挥发动力学模型.结果表明,3种下垫面中,苯系物组分及混合物的挥发速率大小依次为:苯>甲苯>BTEX>二甲苯>乙基苯;而苯系物在静水面上的挥发最快,砂土中次之,壤土中挥发最慢.另外,3种下垫面中苯系物的挥发速率常(系)数与蒸气压的关系均呈线性正相关,挥发速率系数随着组分蒸气压的增大而明显增大.下垫面对苯系物挥发的影响机制主要表现为对挥发面积和介质在挥发扩散过程中可利用孔隙通量的影响.Volatilization behavior of benzene, toluene, ethylb-enzene and xylene （BTEX） behaves complicatedly with different characteristics of the underlying materials. For the need to control and take precautions against volatile organic compounds （VOCs） leak and pollution, and consider the diversification of underlying materials in the area of petroleum works, the test was carried out to study the volatilization behavior of BTEX on three kinds of typical underlying materials in Zibo, Shandong, China. The studies include volatilization dynamic curves of BTEX compounds and mixture and the optimized simulation formulas for them in the base of volatilization kinetics model. The results indicated that, under the same condition, volatility speed of BTEX compounds and mixture was Benzene 〉 Toluene 〉 BTEX 〉 Dimethyl-benzene 〉 Ethylbenzene, and for the three underlying materials, the order of volatility speed was water, sand and soil in sequence. The volatility coefficient linear positive correlated with the vapor pressure, the volatility coefficient remarkably increased with the vapor pressure of BTEX compounds on all the three underlying materials. The mechanism of underlying materials acted on volatilization of BTEX were mainly shown as increasing Volatility area and influence the available original（amount） of pore in the course of volatilization and spread.

关 键 词：苯系物 下垫面 挥发动力学 

分 类 号：X142[环境科学与工程—环境科学]