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首页> 外文期刊>Journal of Applied Geophysics >Influence of non-aqueous phase liquid configuration on induced polarization parameters: Conceptual models applied to a time-domain field case study
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Influence of non-aqueous phase liquid configuration on induced polarization parameters: Conceptual models applied to a time-domain field case study

机译：非水相液体配置对诱导极化参数的影响：概念模型应用于时域现场案例研究

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Resistivity and induced polarization (IP) measurements on soil contaminated with non-aqueous phase liquids (NAPLs) show a great variety in results in previous research. Several laboratory studies have suggested that the presence of NAPLs in soil samples generally decrease the magnitude of the IP-effect, while others have indicated the opposite. A number of conceptual models have been proposed suggesting that NAPLs can alter the pore space in different ways, e.g. by coating the grain surfaces and thus inhibiting grain polarization, or by changing the pore throat size and thus affecting the membrane polarization mechanism. The main aim of this paper is to review previously published conceptual models and to introduce some new concepts of possible residual NAPL configurations in the pore space. Time domain induced polarization measurements were performed at a NAPL contaminated field site, and the data were inverted using the Constant Phase Angle (CPA) model and the Cole-Cole model respectively. No significant phase anomalies were observed in the source area of the contamination when the CPA inverted profiles were compared with soil sampling results of free-phase contaminant concentrations. However, relatively strong phase and normalized phase anomalies appeared next to the source area, where residual free-phase presence could be expected according to the chemical data. We conclude that depending on the NAPL configuration, different spectral IP responses can be expected. In previous research, the NAPL configurations in different samples or field sites are often unknown, and this may to some extent explain why different results have been achieved by different authors. In our field case, we believe that the NAPL forms a more or less continuous phase in the pore space of the source zone leading to an absence of IP anomalies. The increase in phase and normalized phase angle observed next to the source zone is interpreted as a degradation zone. The ongoing biodegradation may have led to a fractionation of the continuous NAPL in the outer part of the original source zone, leading to residual presence of isolated NAPL droplets in the soil pores. With such NAPL. configurations, an increased polarization can be expected according to the electrochemical- and membrane polarization mechanisms. More research is needed to confirm the effects of different NAPL configuration on spectral IF parameters. (C) 2015 Elsevier B.V. All rights reserved.
机译：在先前的研究中，对被非水相液体（NAPL）污染的土壤进行的电阻率和感应极化（IP）测量显示出各种各样的结果。几项实验室研究表明，土壤样品中NAPL的存在通常会降低IP效应的强度，而其他研究则相反。已经提出了许多概念模型，这些模型表明NAPL可以以不同的方式改变孔空间，例如，纳米管。通过涂覆颗粒表面并因此抑制颗粒极化，或通过改变孔喉尺寸并因此影响膜极化机制。本文的主要目的是回顾以前发表的概念模型，并介绍一些可能在孔隙空间中残留NAPL构型的新概念。时域感应极化测量是在NAPL污染现场进行的，分别使用恒定相角（CPA）模型和Cole-Cole模型对数据进行反转。当将CPA倒置剖面与自由相污染物浓度的土壤采样结果进行比较时，在污染源区域未观察到明显的相异常。但是，在源区附近出现了相对较强的相变和归一化相异常，根据化学数据，可能会出现残留的自由相。我们得出结论，根据NAPL配置，可以预期不同的频谱IP响应。在以前的研究中，不同样品或现场站点中的NAPL配置通常是未知的，这在一定程度上可以解释为什么不同的作者获得了不同的结果。在我们的现场案例中，我们认为NAPL在源区的孔隙空间中或多或少形成连续相，从而导致IP异常的缺失。在源区域旁边观察到的相位和归一化相角的增加被解释为退化区域。正在进行的生物降解可能导致原始源区外部的连续NAPL分馏，导致土壤孔中残留分离的NAPL小滴。有了这样的NAPL。根据电化学和膜极化机理，可以预期增加的极化。需要更多的研究来确认不同NAPL配置对频谱IF参数的影响。 （C）2015 Elsevier B.V.保留所有权利。

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