广州市某垃圾填埋场土壤磁学特征及其对重金属污染响应

Magnetic characteristics of soil in a landfill of Guangzhou and its response to heavy metal pollution

为研究垃圾填埋场土壤重金属与环境磁学特征的关联,采集了广州市某垃圾填埋场41组土壤样品进行磁学和地化分析。磁学参数测定结果表明,土壤磁性以人为输入为主,组分主要是软磁性矿物,颗粒较粗。磁性矿物学研究表明,磁性颗粒物主要是磁铁矿、赤铁矿、磁赤铁矿,可能还有针铁矿。重金属与磁学参数相关性分析表明,Zn存在于各种粒径的磁性颗粒物中,Cu、Cr与单畴和多畴磁颗粒共存,Pb、As与较粗的硬磁性矿物共存,Hg与多种矫顽力不同的磁性矿物共存,Ni、Cd与所有磁学参数都未有显著相关关系。可见,一些重金属与磁性颗粒物之间存在伴生关系。

In order to study the relationship between heavy metals and environmental magnetic characteristics in landfill soil,41 groups of soil samples were collected in a landfill of Guangzhou,and their maganetic characteristics and geochemical characteristics were tested.The magnetic measurement results showed that the magnetic source was mainly human input,and the component were mainly soft magnetic minerals of course particles.The magnetic mineralogy research showed that the magnetic particles were mainly magnetite,hematite and magnetohematite,as well as goethite probably.Correlation analysis between heavy metals and magnetic characteristics showed that Zn existed in a variety of magnetic paticles,Cu and Cr coexisted with single domain and multiple domain particles,Pb and As coexisted with coarser hard magnetic minerals,Hg coexisted with a variety of coercive magnetic minerals,but Ni and Cd had little correlation with magnetic characteristics.Therefore,there was an association between heavy metals and magnetic paticles.