广州城市公园绿地重金属环境磁学研究

Studies on Environmental Magnetism of Heavy Metals in Urban Park Green Space of Guangzhou

为研究广州市城市公园绿地土壤环境磁学和重金属元素的相关性,选取广州市主城区14个公园进行采样.共采集133组样品并测试分析土壤的环境磁学数据和地球化学数据,开展土壤环境磁学性质与重金属含量的对比研究.磁学测试结果表明,土壤磁性来源以人为输入的单畴颗粒SD、多畴颗粒MD为主,组分以软磁性矿物为主,部分地区也有硬磁性矿物贡献.相关性分析表明:χ_(ARM)、SIRM对Cu、Zn、Ni、Pb、Cr、Cd和Hg有指示意义;χ_(lf)对Cu、Zn、Ni、Pb有指示意义;S-比值对Cu、Zn、Ni、Pb、Cr、Cd有指示意义;SIRM/χ对Hg有指示意义;χ_(fd)%对As有指示意义.对χ_(lf)与Cu,χ_(fd)与Cu、Ni、As进行回归曲线分析得到的回归方程有效.因此,环境磁学方法可作为一种探索土壤地质环境监测的新技术手段.

In order to study the correlation between soil environmental magnetism and heavy metal elements in urban park green space in Guangzhou,14 parks in the main urban area of Guangzhou City were selected for sampling.A total of 133 samples were collected,and the environmental magnetic data and geochemical data of the soil were tested and analyzed.The comparative study of soil environmental magnetic properties and heavy metal content was carried out.The magnetic test results showed that the source of soil magnetism was mainly artificially-input single domain particle SD and multi domain particle MD,and its component was mainly soft magnetic minerals,with contributions of hard magnetic minerals in some areas.Correlation analysis showed thatχ_(ARM) and SIRM were indicative of Cu,Zn,Ni,Pb,Cr,Cd and Hg;χ_(if) was indicative of Cu,Zn,Ni and Pb;S-ratio was indicative of Cu,Zn,Ni,Pb,Cr and Cd;SIRM/χwas indicative of Hg;andχ_(fd)%was indicative of As.The regression equation obtained from the regression curve analysis ofχ_(if) &Cu andχ_(fd)&Cu-Ni-As was effective.Therefore,the environmental magnetic method can be used as a new technical means to explore soil geological environment monitoring.