中国科学院海岸带环境过程与生态修复重点实验室知识库

环境磁学方法在土壤重金属污染识别中被广泛运用,其具有简单、快速、无破坏性和灵敏度高的特点.本研究以北方典型的围填海区——曹妃甸工业区土壤为例,开展土壤磁化率对重金属积累的指示研究.根据研究区的土地功能规划特征,将研究区土壤分为工业区土壤、生活区土壤以及自然滩涂和湿地土壤共3类.共采集35个表土(0~10 cm)样品和3个土壤剖面柱状样,分析土壤中的磁化率(χlf)、铁(Fe_2O_3)含量及重金属(Cr、Ni、Cu、Zn、As、Pb、Mn、V)元素含量.结果表明:工业区表土磁化率和重金属含量空间分异性较高,受工业生产的影响明显;工业区和生活区剖面中0~20cm的表层土壤中,各重金属均出现不同程...

The environmental magnetism method has been widely applied to identify soil heavy metal pollution，which is characterized by simplicity，efficiency，non-destructivity and sensitivity． The present study used magnetic susceptibility to assess the accumulation of heavy metals in soils of the Caofeidian industrial zone which is a typical reclamation area in northern China． The study area was divided into three sub-zones based on the function，including industrial zone，living zone，natural tidal flat and wetland． A total of 35 topsoil samples ( 0-10 cm) and 3 soil profiles were collected from the three sub-zones． Magnetic susceptibility ( χlf ) ，iron oxide ( Fe2O3 ) contents and heavy metals contents ( Cr，Ni，Cu，Zn，As，Pb，Mn and V) of the samples were analyzed． The results showed that χlf values and heavy metals contents exhibited higher spatial variability in the top soil of the industrial zone，indicating the severe impacts of industrial activities． In the soil profiles of the industrial and living zones，all heavy metals were enriched to different degrees in the upper layer ( 0-20 cm) ． However，there was no significant change of heavy metal contents in the soil profiles of tidal flat which was far from the industrial area． The χlf value was significantly ( P ＜ 0. 01) positively correlated with the contents of Fe2O3，Ni，Cu，As and V in the industrial top soil． This indicated that χlf could be used as an indicator for heavy metal accumulation in the industrial zone． However，the χlf value was not suitable to be an indicator to show the heavy metal accumulation in the soils of living zone and natural tidal flat． This might be associated with the different sources of magnetic materials among the different sub-zones and the special characteristics of the soils in the tidal flat and wetland