婺江表层沉积物重金属元素的磁学响应

Magnetic Response of Metals in Wujiang River Urban Sediment

对婺江流域武义江段、义乌江段和干流金华江的表土沉积物进行了磁学参数的测量,并利用荧光分析检测了表土沉积物的重金属元素。结果表明,婺江流域表层沉积物样品磁性特征以亚铁磁性矿物为主导,存在多相磁性矿物。样品指示婺江流域段多属于由粗多畴颗粒和稳定单畴颗粒组成的混合成分磁性物质。通过测量,婺江表层沉积物样品中重金属Cr、N i、Cu、Zn、Mn均与磁化率呈较强的相关性,表明磁化率对婺江表层沉积物重金属Cr、N i、Cu、Zn、Mn等具有较好的指示作用。婺江表土沉积物重金属普遍超标,武义江表土重金属污染达偏中度污染,支流义乌江、干流金华江均达到偏重污染,推测该结果与各地工业类型、发达程度有关。

Measurements of heavy metal and magnetic were taken on the surface sediment samples obtained from Wuyi section,Yiwu section and Jinghuajiang of Wujiang.The results showed that ferromagnetic minerals were dominated in the sample,and also there were multiphase magnetic minerals.The sample suggested that the mixed magnetic material from Wujiang was composed by coarse poly domain particles and stable single domain particles.Through measurement,it was found that the value of magnetic susceptibility had a close relationship with Cr、Ni、Cu、Zn、Mn＇s,which suggested that the magnetic susceptibility played the role of signifying Cr、Ni、Cu、Zn and Mn.The heavy metal in the surface soil sediment in Wujiang passed the standard.Heavy metal pollution in Wuyi River reached medium level.The one in Yiwujiang and Jinhuajiang all reached heavy pollution level.It was supposed that the result was related to the types and development of industry in each place.