LNAPL污染物及水含量对石英砂介电常数的影响

为研究LNAPL污染物及水含量对石英砂介电常数的影响,首先以石英砂模拟单一土壤环境,利用柴油和水的混合物来模拟轻非水相液体(LNAPL)污染物污染土壤,然后通过矢量网络分析仪和开口同轴探头,分析高频超宽带电磁波在土壤中的反射并计算介电常数。实验结果显示,石英砂介电常数随着体积含水量和含油量的增加而增加,直到达到饱和状态,此时石英砂介电常数趋于稳定;石英砂介电常数实测值处于极化模型和De Loor模型之间,结果与De Loor模型接近。

Influence of LNAPL contamination and water content to dielectric constant of quartz sand

In order to study the influence of LNAPL contamination and water content to dielectric constant of quartz sand，the authors use quartz sand to simulate an environment of homogeneous types of soil，and use the mix- ture of diesel and water to simulate the LNAPL contamination to pollute soil． Then the vector network analyzer and the open- ended coaxial probe have been used to analyze the reflection of the high frequency ultra wideband electro-magnetic wave in the soil to count a dielectric constant． The experiment result indicates that the dielectric constant of quartz sand holds increases as increasing of volumetric water content and volumetric oil content，which is until to their saturated． In this case，the dielectric constant of quartz sand is tending to be stabe． The measured value of quartz sand distributes between Polarized model and DeLoor model，and closer to the latter．