宁沪高速公路句容段两侧土壤磁化率异常与重金属元素的关系研究

高速公路两侧土壤的磁化率从路中央向两侧具有逐渐降低的特征,相对应的样品中的重金属Cu、Pb、Zn、N i、Cr、Fe等元素的含量也具有从路中心向两侧逐渐降低的现象。相关分析表明,土壤磁化率与土壤中的Cu、Pb、Zn、N i、Cr、Fe的相关性显著,因而可以利用磁化率异常来指示高速公路两侧土壤的重金属污染状况。元素的赋存形态分析表明铁锰氧化物态与残渣态是Cu、Pb、Zn、N i、Cr、Fe的主要赋存形式;各元素的形态分析结果与土壤磁化率的相关统计分析表明,高速公路两侧土壤的磁化率与可交换态中的Cu、Pb、Zn、铁锰氧化物态中的Fe、Pb、Zn、有机还原态中的Cu、Cr、Fe、Zn和残渣态中的Cu、Pb、Zn、Cr、Co、N i具有明显的相关性。

Relationship of soil magnetic susceptibility anomaly and heavy metal elements on both sides of Jurong Block, Nanjing-Shanghai Expressway

On both sides of the expressway, soil magnetic susceptibility is characteristic of gradual reduction from road center to the sides,so does the content of some heavy metals like Cu,Pb,Zn,Ni,Cr,Fe,and so on.Related analyses showed a distinct correlativity between soil magnetic susceptibility and elements in the soils such as Cu,Pb,Zn,Ni,Cr, and Fe.So the soil magnetic susceptibility anomaly may indicate the heavy metal contamination in soils on both sides of the expressway.The analysis of element hosting conditions demonstrated that iron-manganese oxides and their residual forms were the main hosting modes for Cu,Pb,Zn,Ni,Cr and Fe;the analyses of the forms of the elements and related statistics of soil magnetic susceptibility revealed that the soil magnetic susceptibility was of distinct correlativity with Cu,Pb and Zn in exchangeable form,Fe,Pb and Zn in iron-manganese oxides,Cu,Cr,Fe,Zn in organic reducing state and Cu,Pb,Fe,Zn,Cr,Co and Ni in residual state.