摘要
【目的】场地污染是目前我国极为重视的一类环境问题,为了划分污染范围并确定污染类型,重点研究污染介质的电阻率对污染浓度的响应特征。【方法】由于场地污染物类型较多,主要针对3种不同污染砂土的电阻率特性开展研究。利用Miller Soil Box对不同污染浓度的盐渍(氯化钠)砂土、重金属(硝酸铜)污染砂土和石油类(柴油)污染砂土的电阻率进行测量,得到不同污染砂土电阻率对不同污染浓度的响应特征。【结果】当其他条件保持不变时,随含水率不断增大,含盐砂土、含硝酸铜砂土及含柴油砂土的电阻率呈幂函数减小,符合Archie公式;当含水率过大时,污染物对砂土电阻率影响极小;在“水-油-砂土”三相体系中,随着含油饱和度的增加,不同含水率的柴油污染砂土的电阻率变化规律不同。【结论】控制不同种类溶液的添加量为烘干介质质量的1%且质量分数一致的条件下,影响不同污染类型砂土电阻率的因素由大到小依次为含盐率、含硝酸铜率、含水率、含油率。该研究结果可为通过砂土电阻率确定污染类型提供理论参考。
【Objective】Soil contamination is a highly concerning environmental issue in China.In order to delineate the extent of contamination and determine the type of pollution,this study focuses on the response characteristics of resistivity in contaminated media to varying contamination concentrations.【Methods】Given the considerable variety of contaminant types present at the site,the resistivity characteristics of three distinct contaminated sands are the primary focus of investigation.The study employed the Miller Soil Box to assess the resistivity of saline soils(sodium chloride),heavy metal-contaminated soils(copper nitrate),and petroleum-contaminated soils(diesel oil)with varying pollution concentrations.Through the measurements,the response characteristics of resistivity in different contaminated sands with varying pollution concentrations were obtained.【Results】When other conditions remained constant,the resistivity of saline soil,copper nitrate-contaminated soil,and diesel-contaminated soil decreased as a power function with increasing moisture content.This result aligned with the Archie equation.When the water content was excessive,the impact of pollutants on the electrical resistivity of the sand was insignificant.In the“water-oil-sand”three-phase system,with the increase of oil saturation,the resistivity of diesel-contaminated soil varied depending on the water content.【Conclusion】Under the condition that the addition of various solution types is controlled to 1%of the mass of the drying medium and the mass fraction remains constant,the factors influencing the resistivity of sandy soil are,in descending order,salinity(NaCl),copper nitrate concentration[Cu(NO_(3))_(2)],water content,and oil content(diesel fuel).The results of this study can serve as a theoretical reference for determining the type of pollution in sandy soil through its resistivity.
作者
刘文辉
张赫鹏
朱欢
李洪良
程家乐
张宏利
郭玺
LIU Wenhui;ZHANG Hepeng;ZHU Huan;LI Hongliang;CHENG Jiale;ZHANG Hongli;GUO Xi(North China University of Water Resources and Electric Power,Zhengzhou 450046,China;Zhongsheng Environmental Technology Development Co.,Ltd.,Xi′an 710065,China)
出处
《华北水利水电大学学报(自然科学版)》
北大核心
2025年第5期142-150,共9页
Journal of North China University of Water Resources and Electric Power:Natural Science Edition
基金
水文水资源与水利工程科学国家重点实验室“一带一路”水与可持续发展科技基金(2021490511)
宁夏回族自治区财政厅项目(6400201901273)
国家自然科学基金项目(41972261)
华北水利水电大学第十五届研究生创新能力提升工程(NCWUYC-202315071)。
