蚌埠市工业区与商业区表土磁学性质的差异及其环境意义

The Difference in Magnetic Properties of Topsoil Between Industrial Areas and Commercial Areas in Bengbu City and Its Environmental Significance

为了研究工业活动对蚌埠市表土磁学性质的影响,在蚌埠市工业区采集33块表土样品,在商业区采集29块表土样品,对2类表土样品的磁学参数和矿物成分进行了测量。结果表明:2类表土样品的磁学性质主要由磁铁矿主导,工业区表土样品中磁性矿物含量较高,磁性矿物粒径粗,SP颗粒含量低,商业区表土样品中磁性矿物含量较低,磁性矿物粒径细,SP颗粒含量高;2类表土样品中主要成分是石英,另外还含有高岭石、伊利石、斜长石、方解石和磁铁矿等矿物。工业区表土由于受到工业粉尘影响,其磁学性质与商业区表土存在差异,具体表现为磁性矿物含量增加、磁性增强,磁性矿物粒径变粗,磁化率与频率磁化率呈弱相关关系,工业区表土磁学参数的变化反映了工业活动对城市表土的影响程度。因此,工业区与商业区表土磁学性质的差异反映了蚌埠市表土环境质量状况。

In order to study the influence of industrial activities on the magnetic properties of topsoil in Bengbu City,33 topsoil samples are collected in the industrial area of Bengbu City and 29 topsoil samples are collected in the commercial area.The magnetic parameters and mineral composition of the two types of topsoil samples are measured.The results show that the magnetic properties of the two types of topsoil samples are mainly dominated by magnetite.The industrial topsoil samples have a higher content of magnetic minerals with coarse particle size and the low content of SP particles.The commercial topsoil samples have a lower content of magnetic minerals with fine particle size and high content of SP particles.The main component of two types of topsoil samples is quartz,and there are also minerals such as kaolinite,illite,plagioclase,calcite and magnetite.Due to the influence of industrial dust,the magnetic characteristics of the topsoil in the industrial area are different from those in the commercial area.The content of magnetic minerals increases,the magnetism enhances,the particle size of magnetic minerals becomes coarser,and the magnetic susceptibility shows a weak correlation with frequency magnetic susceptibility.The changes of magnetic parameters in the industrial topsoil reflect the degree of influence of industrial activities on urban topsoil.Therefore,the difference in magnetic properties of topsoil between industrial areas and commercial areas reflects the environmental quality of topsoil in Bengbu City.