A mathematical model for analysis of sediment core data: Implications for enrichment factor calculations and trace-metal transport mechanisms

摘要: The concentration of trace metal within a sediment core has been modelled by considering three components, the background concentration, Cb, that due to accelerated erosion, Ca, and an anthropogenic pollution term, Cp. Major cations associated with clay minerals such as Al, K Mg do not have component. Iterative regression trace-metal against one these elements permits isolation model was applied comprehensive data set for collected from seasonally anoxic lake. Three groups metals were identified. Type A (Zn Cd) did component Ca. They are thought passed through solution phase before being recruited sediment. Type-B (Fe, Ni, Cu Pb) correlated well mineral probably transported particles. Mn, type-C metal, inversely related cations, reflecting its labile redox chemistry. Various methods calculating enrichment compared new after analysis procedure (ERA method). Although simple ratios appropriate type-A neither this nor factors can adequately assess type-B metals.