三氯乙烯污染土壤的复电阻率特征和频谱参数研究

doi:10.13745/j.esf.sf.2021.2.4

地学前缘 ›› 2021, Vol. 28 ›› Issue (5): 114-124.DOI: 10.13745/j.esf.sf.2021.2.4

• 地下水污染监测与模拟 • 上一篇下一篇

三氯乙烯污染土壤的复电阻率特征和频谱参数研究

张振宇¹(), 许伟伟², 邓亚平³, 任静华², 施小清¹^,^*(), 吴吉春¹

1.南京大学地球科学与工程学院表生地球化学教育部重点实验室, 江苏南京 210023
2.江苏省地质调查研究院自然资源部国土(耕地) 生态监测与修复工程技术创新中心, 江苏南京 210018
3.合肥工业大学资源与环境工学院, 安徽合肥 230009

收稿日期:2020-05-20 修回日期:2021-08-19 出版日期:2021-09-25 发布日期:2021-10-29
通讯作者: 施小清
作者简介:张振宇(1996—),男,硕士,主要从事水文地球物理方面研究工作。E-mail: MF1829038@smail.nju.edu.cn
基金资助:
自然资源部国土(耕地)生态监测与修复工程技术创新中心开放课题;国家自然科学基金项目(41977157)

Complex resistivity properties and spectral parameters of TCE contaminated soils

ZHANG Zhenyu¹(), XU Weiwei², DENG Yaping³, REN Jinghua², SHI Xiaoqing¹^,^*(), WU Jichun¹

1. Ministry of Education Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China
2. Ministry of Natural Resources Technical Innovation Center of Ecological Monitoring Restoration Project on Arable Land, Geological Survey of Jiangsu Province, Nanjing 210018, China
3. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China

Received:2020-05-20 Revised:2021-08-19 Online:2021-09-25 Published:2021-10-29
Contact: SHI Xiaoqing

摘要/Abstract

摘要：

复电阻率法(complex resistivity, CR)由于其对孔隙水化学性质、固-液界面和流体含量的敏感性已成为具有良好前景的污染物识别工具。本研究选取三氯乙烯(trichloroethylene, TCE)作为典型有机污染物,利用频谱激电仪对TCE污染土壤进行了复电阻率测量,讨论孔隙水盐度、水饱和度和土壤类型对污染土壤的复电阻率特征和频谱参数影响。试验结果表明:污染土样的复电阻率均随水饱和度的降低和孔隙水盐度的减小而增大;土壤黏土含量影响孔隙水连续性,当孔隙水出现不连续状态时,实部和虚部出现大幅度变化。总充电率M随着孔隙水盐度的增加而增加,随水饱和度的降低先减后增。黏土颗粒重排导致的比表面积减小使得总充电率M减小,双电层极化加强使总充电率M升高;平均弛豫时间常数随孔隙水盐度的升高而降低,二者呈对数相关,随水饱和度变化的主要原因为可极化孔隙尺寸的变化。本研究探讨了地球物理参数与水文地质参数间的关系,为SIP方法在实际有机污染场地调查与评估提供了理论依据。

关键词: 复电阻率法, 激发极化, 三氯乙烯, Debye模型, 频谱参数

Abstract:

The complex resistivity has become a promising contaminant monitoring tool due to its sensitivity to pore water chemical properties, solid-liquid interface and fluid content. In this study, we chose trichloroethylene (TCE) as a typical organic contaminant and measured the complex resistivity of TCE contaminated soils by SIP method. We studied the effects of pore water salinity, water saturation and soil types on the complex resistivity characteristics and spectral parameters of TCE-contaminated soils. Results show that the complex resistivity of contaminated soil samples increases with decreasing water saturation and pore water salinity. The clay content affects the continuity of pore water. When the pore water is discontinuous, the real and imaginary parts change greatly. The total chargeability (M) increases with decreasing pore water salinity and decreases at first and then increases with decreasing water saturation. M is also reduced by decreasing specific surface area caused by the rearrangement of clay particles and increased by double layer polarization. The mean relaxation time decreases with increasing pore water salinity as shown by a logarithmic correlation. The main reason for the variation of M with water saturation is the change of polarizable pore size. This study establishes a relationship between geophysical and hydrogeological parameters, thus providing a theoretical basis for SIP field measurements.

Key words: complex resistivity, induced polarization, trichloroethylene, Debye model, spectral parameters

中图分类号:

张振宇, 许伟伟, 邓亚平, 任静华, 施小清, 吴吉春. 三氯乙烯污染土壤的复电阻率特征和频谱参数研究[J]. 地学前缘, 2021, 28(5): 114-124.

ZHANG Zhenyu, XU Weiwei, DENG Yaping, REN Jinghua, SHI Xiaoqing, WU Jichun. Complex resistivity properties and spectral parameters of TCE contaminated soils[J]. Earth Science Frontiers, 2021, 28(5): 114-124.

图/表 14

图1 SIP测量试验装置示意图 A,B—供电电极;M,N—测压电极。

Fig.1 Experimental setup for the spectral induced polarization (SIP) measurements

图2 琼脂凝胶-铁砂网电极测试 a—实部电阻率;b—相位。

Fig.2 Testing the agar gel-iron mesh electrodes

表1 土壤样品的物理化学性质

Table 1 Physical and chemical properties of soil samples

样品	类型	阳离子交换容/ (cmol·kg^-1)	有机质含量/%	不同粒径颗粒占比/%			比表面积BET/ (m²·g^-1)	pH值	Zeta电位/mV
样品	类型	阳离子交换容/ (cmol·kg^-1)	有机质含量/%	黏粒	粉粒	砂粒	比表面积BET/ (m²·g^-1)	pH值	Zeta电位/mV
土样A	砂质土	10.76	0.16	9.56	10.37	80.07	21.22	9.75	-22.8
土样B	粉砂质土	5.52	0.29	6.65	76.87	16.48	8.57	7.62	-22.6

图3 饱水土样A在不同孔隙水盐度下的复电阻率频谱曲线

Fig.3 Resistivity vs. frequency plots under different pore water salinity for saturated sample A

图4 饱水土样B在不同孔隙水盐度的相位曲线

Fig.4 Phase vs. frequency plots under different pore water salinity for saturated sample B

图5 土样A在0.1 S·m-1(a)、0.01 S·m-1(b)和1 S·m-1(c)盐度下不同水饱和度的复电阻率频谱曲线

Fig.5 Resistivity vs. frequency curve for sample A under different levels of water saturation at 0.1 S·m-1(a), 0.01 S·m-1(b) and 1 S·m-1(c) (EC)

图6 土样B在0.1 S·m-1(a)、0.01 S·m-1(b)和1 S·m-1(c)盐度下不同水饱和度的相位曲线

Fig.6 Phase vs. frequency curve for sample B under different levels of water saturation at 0.1 S·m-1(a), 0.01 S·m-1(b) and 1 S·m-1 (c) (EC)

图7 土样A(a)和B(b)在0.1 S·m-1条件下不同水饱和度的复电阻率频谱曲线

Fig.7 Plot of resistivity vs. frequency under different water saturation at 0.1 S·m-1 (EC) for samples A (a) and B (b)

图8 总充电率与孔隙水盐度的关系

Fig.8 Relationship between total chargeability and pore water salinity

图9 总充电率与水饱和度的关系(砂-黏土)

Fig.9 Relationship between the total chargeability and water saturation (sand-clay)

图10 0.1 S·m-1盐度下两种土样总充电率与水饱和度的关系

Fig.10 Relationship between the total chargeability and water saturation under 0.1 S·m-1 (EC) for samples A and B

图11 平均弛豫时间常数与孔隙水盐度的关系

Fig. 11 Relationship between the mean relaxation time and pore water salinity

图12 平均弛豫时间常数与水饱和度的关系

Fig.12 Relationship between the mean relaxation time and water saturation

图13 0.1 S·m-1盐度下两种土样平均弛豫时间常数与水饱和度关系

Fig.13 Relationship between the mean relaxation time and water saturation under 0.1 S·m-1 (EC) for samples A and B

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三氯乙烯污染土壤的复电阻率特征和频谱参数研究

Complex resistivity properties and spectral parameters of TCE contaminated soils

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