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首页> 外文期刊>Environmental Science and Pollution Research >Using a multi-method approach based on soil radon deficit, resistivity, and induced polarization measurements to monitor non-aqueous phase liquid contamination in two study areas in Italy and India
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Using a multi-method approach based on soil radon deficit, resistivity, and induced polarization measurements to monitor non-aqueous phase liquid contamination in two study areas in Italy and India

机译：基于土壤氡缺陷，电阻率和诱导极化测量的多方法方法，以监测意大利和印度的两个研究区域中的非水相液体污染

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摘要

Geochemical and geophysical surveys employing radon deficit, resistivity, and induced polarization (IP) measurements were undertaken on soil contaminated with non-aqueous phase liquids (NAPLs) in two different sites in India and in Italy. Radon deficit, validated through the comparison with average soil radon in reference unpolluted areas, shows the extension of contamination in the upper part of the unsaturated aquifers. In site 1 (Italy), the spill is not recent. A residual film of kerosene covers soil grains, inhibiting their chargeability and reducing electrical resistivity difference with background unpolluted areas. No correlation between the two parameters is observed. Soil volatile organic compounds (VOCs) concentration is not linked with radon deficit, supporting the old age of the spillage. NAPL pollution in sites 2a and 2b (India) is more recent and probably still active, as demonstrated by higher values of electrical resistivity. A good correlation with IP values suggests that NAPL is still distributed as droplets or as a continuous phase in the pores, strengthening the scenario of a fresh spill or leakage. Residual fraction of gasoline in the pore space of sites 2a and 2b is respectively 1.5 and 11.8?kg per cubic meter of terrain. This estimation is referred to the shallower portion of the unsaturated aquifer. Electrical resistivity is still very high indicating that the gasoline has not been strongly degraded yet. Temperature and soil water content influence differently radon deficit in the three areas, reducing soil radon concentration and partly masking the deficit in sites 2a and 2b.
机译：采用氡缺陷，电阻率和诱导极化（IP）测量的地球化学和地球物理调查在印度和意大利两种不同地点的非水相液体（NAPLS）污染的土壤上进行。通过与参考未盖子区域的平均土氡的比较验证的氡缺陷，显示出在不饱和含水层的上部污染的延伸。在现场1（意大利），泄漏不是最近的。煤油的残留膜覆盖土粒，抑制其充电能力，降低电阻率差异与背景未受污染的区域。观察到两个参数之间的相关性。土壤挥发性有机化合物（VOCS）浓度与氡缺陷无关，支持溢出的老年。在站点2a和2b（印度）中的Napl污染是更近来的，并且可能仍然有效，所以通过更高的电阻率值证明。与IP值的良好相关性表明NaPL仍然作为漏洞分配或孔隙中的连续相位，加强新鲜泄漏或泄漏的情况。位点2a和2b的孔隙空间中的汽油的残余部分分别为每立方米的1.5和11.8Ωkg。该估计被称为不饱和含水层的浅部分。电阻率仍然非常高，表明汽油尚未受到强烈降解。温度和土壤水分含量影响三个区域的不同氡缺损，减少土壤氡浓度并部分地掩盖位点2a和2b中的缺陷。

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