LNAPL 污染土壤介电性质的实验研究——-以石英砂为例

为研究轻非水相液体污染土壤的介电性质，在实验室条件下，利用石英砂( 粒径0. 106 ～ 0. 212 mm) 、柴油和水的混合物模拟LNAPL 污染土壤，采用开口同轴探头法利用高频电磁波( 200 MHz ～ 3 GHz) 在污染土壤中的反射获得介电常数，并分析土壤中油水体积含量变化与相对介电常数的变化规律。实验结果表明: 非饱和状态下石英砂的相对介电常数随着体积含水量和含油量的增大而增大，达到饱和状态后体积含油量的增加对相对介电常的影响不明显; 被污染的非饱和状态的砂样在放置过程中，相对介电常数随着放置时间的延长呈现先增大最后趋于稳定的变化趋势。

Experiment on dielectric property of LNAPL contaminated soil a case study in quartz sand

In order to study the dielectric property of light non-aqueous phase liquid （LNAPL） contaminated soil, the authors simulate LNAPL contaiminated soil by quartz sand （particle size 0. 106 -0. 212 mm）, diesel and water under laboratory condition, and then use the open-ended coaxial probe method to detect the dielectric constant in the contaiminated soil by high frequency electromagnetic wave （200 MHz -3 GHz） and analyze the change regulation of soil-water volume content with the relative dielectric constant. The experimental results showed that relative dielectric constant of non-saturated quartz sand raised with the increasing of volumetric water content and oil content, but the variation of dielectric constant was not obvious with the increasing of oil content when the sand was saturated. The relative dielectric constant of the contaminated non-saturated soil increased first, and tended to stable later as time prolonged.