摘要
PFAS新型污染物是当前环境水文地球物理学的研究热点,但其电阻率特性尚未清楚.为了探究PFAS溶液电特性及砂样含水溶液饱和度与溶液浓度对PFAS污染砂土电阻率的影响.本研究以PFOA为PFAS污染物的代表,设置不同浓度PFOA溶液并改变砂样盒的含水溶液饱和度,利用高密度电法仪监测砂样盒进行电阻率试验,结果表明:(1)砂样被PFOA溶液饱和的过程中,砂样电阻率随着砂样含水溶液饱和度的增大逐渐减小,砂样完全饱和时砂样电阻率值降到最低.对两者之间的关系均可用Archie公式较好拟合,拟合结果的相关系数R2均接近1.(2)在砂样被PFOA溶液完全饱和的状态下,砂样电阻率值会受PFOA溶液浓度的影响.砂样电阻率随溶质浓度的增大呈现幂函数关系的下降,幂函数拟合的相关系数R2值为0.8977,拟合效果较好.(3)在砂样饱和与非饱和过程试验中,砂样电阻率值会随着介质含水溶液饱和度的改变呈相应的动态变化.对于砂样电阻率与介质含水溶液饱和度的关系曲线可以用Archie公式很好的拟合,相关系数R2为0.9980.本研究获取了砂样被PFOA溶液饱和过程中的电阻率数据,并得到了砂样电阻率与多孔介质含水溶液饱和度及溶液浓度之间的关系曲线,为将电阻率数据转换为定量的污染物浓度奠定了基础,具有一定的实际应用价值.
PFAS are emerging persistent organic pollutants in groundwater environment.In order to explore the electrical characteristics of PFAS solution and the influence of water saturation and solution concentration of sand samples on the resistivity characteristics of PFAS contaminated sand.In this study,PFOA was used as the representative of PFAS pollutants,and a sand sample box was used to conduct resistivity tests.The results showed that:(1)in the process of saturated with PFOA solution,the resistivity of the sand sample gradually decreased with the increase of water saturation.The results showed that the electrical properties of the solution were consistent with those of NaCl solution.The resistivity of sand samples decreases with the increase of water saturation of sand samples,and decreases to the lowest value when the sand samples are fully saturated.Archie formula was used to fit the relationship between them,and the correlation coefficients R2 of the fitting results were all close to 1.It indicates that in the process of sand sample being saturated by solution,the resistivity of sand sample changes with the change of water saturation of sand sample,and the relationship between the two can be well fitted by Archie formula.(2)When the sand sample is completely saturated with PFOA solution,the resistivity value of the sand sample will be affected by the concentration of PFOA solution.The resistivity of sand samples decreases exponentially with the increase of solute concentration,and the correlation coefficient R2 value of the exponential function fitting is 0.8977,indicating that the fitting effect is good,that is,the resistivity changes exponentially with the change of PFOA solution concentration when the sand sample is completely saturated.(3)In the saturated and unsaturated process tests of sand samples,the resistivity of sand samples shows a corresponding dynamic change with the change of water saturation of medium.Archie formula can be used to fit the curves of resistivity and saturation,and the correlation coefficient R2 is 0.9980.In this study,the resistivity data of sand samples in the process of saturation by PFOA solution were obtained,and the relationship curve between the resistivity of sand samples and water saturation of porous media and solution concentration was obtained,which laid a foundation for converting resistivity.
作者
朱银侠
刘汉乐
杨登波
廖统高
汪科
张楚悦
ZHU YinXia;LIU HanLe;YANG DengBo;LIAO TongGao;WANG Ke;ZHANG ChuYue(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,China)
出处
《地球物理学进展》
CSCD
北大核心
2023年第4期1912-1918,共7页
Progress in Geophysics
基金
国家自然科学基金(42277192)
第三期广西高等学校千名中青年骨干教师培育计划联合资助。
