Chen Ru, Zhang Yan, Meng Zhaohui, Zhan Honglei, Zhao Kun, Wu Xiaodong, Yue Wenzheng, Sun Encheng
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China.
Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing, 102249, China.
Anal Sci. 2020 Apr 10;36(4):431-434. doi: 10.2116/analsci.19P337. Epub 2019 Nov 22.
Although an accurate detection of trace oil leaks is of the utmost important for soil protection, the typically used techniques fail to provide rapid assessment of less than 20 parts per million (ppm) of oil in soil. Terahertz (THz) time-domain spectroscopy, an optical method with high sensitivity to polar organics, was used to characterize the content of crude oil in soils. A linear model was built between the concentration of crude oil and the THz attenuation coefficient, which predicted the limit of detection ranging from 4.11 to 16.2 ppm. Some organics, such as aromatic and aliphatic compounds, contribute to larger absorption in the THz range than minerals. Effective-medium theory was optimized to elucidate the crude oil content dependence of THz dielectric constants. Consequently, THz technology could be an effective method for detecting trace oil leakage in soil.
尽管准确检测微量石油泄漏对于土壤保护至关重要，但常用技术无法对土壤中低于百万分之二十（ppm）的石油进行快速评估。太赫兹（THz）时域光谱法是一种对极性有机物具有高灵敏度的光学方法，用于表征土壤中的原油含量。建立了原油浓度与太赫兹衰减系数之间的线性模型，该模型预测的检测限为4.11至16.2 ppm。一些有机物，如芳香族和脂肪族化合物，在太赫兹范围内的吸收比矿物质更大。优化了有效介质理论以阐明太赫兹介电常数对原油含量的依赖性。因此，太赫兹技术可能是检测土壤中微量石油泄漏的有效方法。
