崇明东滩湿地沉积物重金属污染的磁诊断

对取自崇明东滩的高潮滩、中潮滩和低潮滩的沉积物柱样进行了磁学、粒度、重金属含量等指标的分析、比较与综合研究. 结果表明:在以粉砂为主的崇明东滩，通过污染负荷指数法进行评价，除低潮滩无污染外，中潮滩和高潮滩均有中度的重金属污染. 选取中度重金属污染的高潮滩沉积物柱样进行粒度、重金属含量以及磁性参数的相关性分析显示，χ_fd，χ_ARM/SIRM与重金属含量和粘土(粒径<4 μm)之间有较高的相关性，并以此建立了磁诊断线性回归模型；χ_fd和χ_ARM/SIRM可作为重金属含量的替代指标. 

Magnetic Diagnosis of Heavy Metal Pollution in Sediments of Chongming Wetland

Three core sediments, which were respectively collected in high, medium and low tidal flats from Chongming Wetland, were compared and analyzed for magnetics, particle size and heavy metals contents. According to the assessment by pollution load index method, in Chongming Wetland which was mainly with silty soil, both medium and high tidal flats were moderately polluted with heavy metals,while low-tidal flat had not been polluted. The medium-tidal flat with moderate heavy metals pollution was chosen to perform correlation analysis of particlesize, heavy metals and magnetic parameters. The magnetic parameters χ_fd, χ_ARM/SIRM and heavy metals contents are closely correlated with clay less than 4 μm, and linear regression models for magnetic diagnosis were established. χ_fd and χ_ARM/SIRM can be regarded asalternative indicators for heavy metals contents.