LNAPL污染土壤介电性质的实验研究-以石英砂为例
Experimental study on Dielectric properties of LNAPL Contaminated Soil- A Case in Quartz Sand
为了研究轻非水相液体 (Light Non-Aqueous Phase Liquid,简称LNAPL)污染土壤的介电性质,本文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出先增大最后趋于稳定的变化趋势。本研究对于利用地下介质的介电特性研究LNAPL污染的监测工作具有重要的指导意义。
In order to study the dielectric properties of light non-aqueous phase liquid (LNAPL) contaminated soil which was simulated by the mixture quartz sand ( particle size 0.106~0.212 mm ), we use the open-ended coaxial probe method which use the high frequency electromagnetic wave ( 200 MHz~3 GHz ) to detect the dielectric constant under the laboratory conditions, and analyze the soil water content and oil volume changes with the relative dielectric constant variation. The experimental results showed that relative dielectric constant of non saturated sand increases with the volumetric water content and oil content increasing, but the variation of the dielectric constant is not obvious when the sand is saturated. The relative dielectric constant of the contaminated non-saturated and increased after some hours and finally tends to be stable. These results can provide the guidance significance on monitoring the LNAPL-pollution by using dielectric properties of the underground medium.
李洪丽、邹立龙、鹿琪、冯晅、梁文婧、刘财
环境污染、环境污染防治环境科学理论地球物理学
石英砂LNAPL高频电磁波相对介电常数饱和
Quartz sandLNAPLHigh frequency electromagnetic waveRelative dielectric constantSaturated
李洪丽,邹立龙,鹿琪,冯晅,梁文婧,刘财.LNAPL污染土壤介电性质的实验研究-以石英砂为例[EB/OL].(2011-11-22)[2025-08-18].http://www.paper.edu.cn/releasepaper/content/201111-358.点此复制
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