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根据长江口南岸边滩南区排污口附近采集的柱样的磁性测量和重金属含量分析 ,探讨了磁性测量方法在沉积物重金属污染记录信息提取方面的应用价值。结果表明 ,磁性参数χARM、χfd% 、χARM/χ和 χARM/SIRM与重金属Cu、Zn、Pb、Cr具有极为相似的垂向变化特征 ,反映了细晶粒亚铁磁性矿物对重金属的吸附作用 ,以及沉积物粒度组成对重金属含量的影响。根据上述相关性 ,建立了利用磁性参数推断重金属含量的线性回归模型。不同柱样基于磁性参数 χARM的层位对比表明 ,不同部位沉积物中的重金属记录可以对比 ,但其含量却存在较大的差异 ,反映了重金属空间分布的复杂性。本项研究表明 ,作为一种辅助手段 ,磁性测量可以在高分辨率的重金属污染研究中发挥重要作用。
According to the magnetic measurements and heavy metal contents of the column samples collected near the sewage outfall on the south bank of the south bank of the Yangtze River estuary, the application value of magnetic measurement methods in the extraction of recorded information of heavy metal pollution in sediments was discussed. The results show that the magnetic parameters χARM, χfd%, χARM / χ and χARM / SIRM have very similar vertical variation characteristics with heavy metals Cu, Zn, Pb and Cr, which reflect the adsorption of heavy metals by the fine grain ferrimagnetic minerals, As well as the effect of sediment particle size on heavy metal content. Based on the above correlation, a linear regression model for estimating heavy metal content using magnetic parameters was established. The comparison of different column samples based on the χARM horizon shows that the records of heavy metals in sediments of different sites can be compared, but their contents are quite different, reflecting the complexity of spatial distribution of heavy metals. This study shows that magnetic measurements can play an important role in the study of high-resolution heavy metal pollution as an adjunct.