辽宁省阜新市主城区表土磁化率与重金属特征及关系的定量分析  

Quantitative Analysis of Characteristics and Relationship between Topsoil Magnetic Susceptibility and Heavy Metals in Main Urban Area of Fuxin City in Liaoning Province

作　　者：王天依 潘颖 于淼[1] WANG Tianyi;PAN Ying;YU Miao(School of Geography,Liaoning Normal University,Dalian 116029,China;Fuxin Senior High School,Fuxin 123000,China)

机构地区：[1]辽宁师范大学地理科学学院,辽宁大连116029 [2]阜新市高级中学,辽宁阜新123000

出　　处：《环境科学研究》2021年第11期2722-2730,共9页Research of Environmental Sciences

基　　金：国家自然科学基金项目(No.42071013);辽宁师范大学博士启动科研基金项目(No.BS2018L014,2021BSL015)。

摘　　要：煤炭城市表土的磁学特征与重金属累积存在密切联系,但其确切的数量关系仍然模糊.以阜新市主城区表土(0~20 cm)为研究对象,通过对磁化率及重金属(Cu、Zn、Cd、Hg)含量的测试以及空间插值分析,系统分析了表土的磁化率特征、重金属富集特征,并运用通径分析明确了二者的数量关系.结果表明:①阜新市主城区表土质量磁化率(χlf)、频率磁化率(χfd)平均值分别为196.88×10^(-8) m^(3) kg、2.41%,二者变异程度均较高;χlf高值主要集中在主城区的中心(围绕海州露天煤矿)及西北部,而χfd高值区则大体与χlf低值区对应,且呈斑状分布的格局特点.②Cu、Zn、Cd、Hg的平均含量分别为45.13、107.96、0.13、0.11 mg/kg,且点源污染特征明显;其中,Cu、Zn、Cd的富集多集中于经济活动频繁的主城区中心区域及海州露天矿的周边地带,Hg含量的高值区主要沿着细河呈东北—西南方向的带状分布特征.③主城区表土χ_(lf)与Cu、Zn、Cd的含量均呈显著正相关,且χlf与Zn、Cu含量存在χ_(lf)=-161.122+1.437[Zn]+4.729[Cu]的数量关系;χ_(fd)与Zn、Cd含量均呈显著负相关,且χ_(fd)与Cd含量存在χ_(fd)=3.720-10.154[Cd]的线性关系.研究显示,阜新市主城区表土重金属存在明显富集,其中,Cu、Zn、Cd的累积程度与磁化率呈显著相关,在城市表土环境的监测治理工作中,宜采用简便快捷的磁化率测试以指示相应重金属的富集状况.In the topsoil of a few coal resource-based cities,a consensus has emerged that the accumulation of heavy metals is closely related to magnetic susceptibility.However,the quantitative relationship between heavy metal content and magnetic susceptibility in the topsoil remains poorly understood.In order to understand the quantitative relationship between the content of heavy metals such as copper(Cu),zinc(Zn),cadmium(Cd),and mercury(Hg)in the topsoil and the magnetic susceptibility,we took the topsoil(0-20 cm)in the main urban area of Fuxin City as the research object,collected samples,and analyzed the magnetic susceptibility and heavy metal content of the soil samples.On this basis,we used mathematical-statistical,spatial interpolation,correlation,and path analyses to determine the content distribution,spatial distribution,and quantitative relationship between magnetic susceptibility and heavy metal content.The following conclusions can be drawn by this study:(1)The average values of mass susceptibility and frequency susceptibility of the topsoil in Fuxin City were 196.88×10^(-8) m^(3) kg and 2.41%,respectively,with a relatively large numerical variation of the susceptibility.The mass susceptibility of the topsoil was mainly concentrated in the center of the main urban area(around the Haizhou strip mine)and the northwest of the main urban area.The area with high frequency susceptibility generally corresponded to the area with low mass susceptibility,and the spatial distribution pattern of frequency susceptibility showed a patchy distribution characteristic.(2)The average contents of Cu,Zn,Cd and Hg were 45.13,107.96,0.13,and 0.11 mg/kg,respectively,and the point source enrichment of these heavy metals was distinct.The enrichment of Cu,Zn,Cd was primarily concentrated in the central area of the main urban area with frequent economic activities and the surrounding area of the Haizhou strip mine.The enrichment area of mercury was mainly distributed along the Xihe River in the northeast-southwest direction.(3)The mas

关 键 词：阜新市 表土 磁化率 重金属 相关性 通径分析 

分 类 号：X123[环境科学与工程—环境科学]