铬污染土壤电阻率特性及其影响因素研究

Investigation on the electrical resistivity of chromium contaminated soil

为了研究电阻率法用于土壤环境监测的可行性,本文采用SoilMillerBox法进行铬污染土壤的电阻率影响因素实验,依据实验数据建立了污染土壤电阻率与三因素(铬污染物含量、含水率、土壤孔隙比)之间的关系模型,并于模拟污染场地中利用电阻率层析成像法对其进行验证.结果表明,根据三因素正交实验得到影响污染土壤电阻率变化的主次因素依次为:铬污染物含量、土壤孔隙比、含水率.铬污染土壤的电阻率随铬污染物含量、含水率的升高而降低,随土壤孔隙比的升高而升高.在模拟污染场地模型验证中,层析成像的电阻率结果与电阻率模型结果吻合较好,证实了电阻率法用于铬污染土壤监测的可行性.

Soil Miller Box method is used to study the factors that influence the electrical resistivity of chromium-contaminated soil.According to orthogonal experiment,the three factors that influence the specific resistance changes of chromium-contaminated soil are ranked in the following order：chromium pollutant concentration,water content and void ratio.The electrical resistivity of chromium-contaminated soil decreases as the chromium pollutant concentration and water content increase,and increases as the void ratio increases.Based on the model of correlation of specific resistance of contaminated soil and the three factors according to experimental data,as well as demonstration in simulated contaminated field with resistivity tomography method,the results of resistivity tomography and specific resistance model agree well,confirming that the resistivity method is applicable to monitoring contaminated soil environment.