钢厂周边污染土壤的电性与磁性特征及其环境意义  

Electric and Magnetic Properties of Contaminated Soil Around a Steel Plant as Well as Their Environmental Significance

作　　者：李永涛[1] 郭高山 顾延生[2] 韦林[1] 何思远[1] 

机构地区：[1]中国地质大学(武汉)地球物理与空间信息学院,武汉430074 [2]中国地质大学(武汉)环境学院,武汉430074

出　　处：《吉林大学学报（地球科学版）》2017年第5期1543-1551,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(41572153);湖北省科技支撑计划资助项目(2015BCE077)~~

摘　　要：利用直流电测深、环境磁学以及矿物学方法,开展对一钢铁厂周边土壤的污染评价研究,获得了土壤垂向电阻率与磁化率分布特征。研究表明,随着污染土剖面的深度由底部至地表,土壤电阻率逐渐减小,磁化率和重金属含量反而增高;该变化特征反映了土壤受污染的程度与钢铁公司历年粗钢产量及武汉市历年汽车保有量的变化程度相对应。通过对污染样品的磁滞回线、热磁曲线和SEM/EDX等矿物学分析,污染样品的矿物成分以磁铁矿和赤铁矿为主,以准单畴(PSD)颗粒存在,形貌特征和物质成分与成土过程中形成的磁性颗粒明显不同。由于土壤的电性与磁性都具有良好的污染程度指示作用,所以土壤的电性与磁性研究可以应用于土壤污染程度的评价,两者联合运用可大大提高土壤污染程度评价的分辨率。The distributing properties of vertical resistivity and susceptibility of soils around an iron and steel plant have been obtained for pollution assessment using DC depth sounding, environmental magnetism and mineralogy. The study shows that soil resistivity values decrease gradually, while susceptibility and heavy metal content increase from the bottom to the surface of the contaminated soils, indicating a correspondence between the degree of soil pollution and the crude steel output each year and the vehicle numbers of Wuhan City. Through the analyses on hysteresis loop, thermal magnetic curve, and SEM/EDX mirieralogy for the contaminated samples, the mineral components of polluted samples are predominantly magnetite and hematite, existing in pseudo-single domain （PSD）, obviously different from the magnetic grain formed during pedogenic process in aspect of feature and ingredient. Because the electric and magnetic properties of soil have good indication to pollution degree, the study of soil electric and magnetic properties can be used to assess soil pollution, and the combined use of these two properties can also greatly improve the resolution of soil pollulion assessment.

关 键 词：钢厂 污染土壤 电性 磁性 重金属 环境意义 

分 类 号：P631.2[天文地球—地质矿产勘探] X833[天文地球—地质学]