中文摘要：

重非水相液体（Dense Non-Aqueous Phase Liquid,DNAPL）与水相的界面面积是影响DNAPL在地下水中溶解速率的关键参数。通过设计二维砂箱实验,运用界面分配示踪法测定DNAPL残余饱和态下的界面面积。为量化分析保守示踪剂Br^-的存在对实验结果的影响,共进行两组实验,Br^-和界面分配示踪剂的注入方式分别为依次注入和同时注入。结果表明：（1）两组实验测定的固液相分配系数K_d值分别为0.079 m L/g和0.142 m L/g,表明Br^-的存在增大了介质对界面分配示踪剂的吸附作用;（2）两组实验测定的单位体积多孔介质中界面面积值分别为215 cm^2和237 cm^2,表明Br^-的存在增大了DNAPL与水相交界面对界面分配示踪剂的吸附作用;（3）在本实验范围内（Br^-浓度C_（Br）≤200mg/L）,K_d值与Br^-浓度呈良好的线性关系（K_d=0.00032C_（Br）＋0.0798）,可用于对砂介质的K_d值进行估算和验证。

英文摘要：

The dense nonaqueous-phase liquid （DNAPL）-water interracial area is a key parameter for the rate of DNAPL dissolution in groundwater, In the present study, the DNAPL-water interfacial area at residual saturation was measured using interracial partitioning tracer tests （IPTT） method in a two-dimensional flow cell. The influence of nonreactive tracer Br- on the measurement of DNAPL-water interfacial area was analyzed. Two sets of experiments were conducted. For the first set, Br- and interfacial partitioning tracer were injected in turn, and for the second set, Br- and interracial partitioning tracer were injected at the same time. The results showed that： （1） in the two sets of experiments, the measured equilibrium sorption coefficient Kd were 0. 079 mL/g and 0. 142 mL/g respectively, which indicated that the presence of Br- increased the adsorption of media to interracial partitioning tracer; （2） the measured interfacial area were 215 cm^2 and 237 cm^2 respectively, which indicated that the presence of Brincreased the interface adsorption to interracial partitioning tracer; （3） The was a linear relationship between Ka value and Brconcentration （Kd = 0. 00032CBr ＋ 0. 0798, CBr ≤200mg/L） , which can be used for Kavalue estimation of sand media.