苯系物在不同下垫面的挥发机理研究

Volatilization Mechanism of BTEX on Different Underlying Surface

用粉土、沙土及纯净水模拟下垫面,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、挥发动力学模型和最优拟合公式。结果表明:苯系物单组分及混合物在同一下垫面上的挥发速率不同;不同下垫面上,苯系物在静水面上的挥发最快,粉土上挥发最慢;3种下垫面中苯系物的挥发速率常数与蒸汽压呈线性关系。

The silt,sandy soil and pure water were chosen as the underlying surface to study volatile behavior of the benzene series compounds,to get volatilization kinetics curve,volatilization kinetics model and optimal fitting formula of different types underlying surface of BTEX in single component and mixture.The results show that the single component and mixture of BTEX have the different volatilization rate at the same underlying surface;at the different underlying surface,evaporation of BTEX in pure water underlying surface is evaporation the fastest,in silt underlying surfacen is the most slowly;benzene series volatilization rate has a linear relationship with the vapor pressure in the 3 kinds of underlying surfaces.