地质风化和人类活动可导致微量有毒金属在沉积物中富集;前者被定义为地质源或自然源(Geogenic sources),后者被定义为人为源(Anthropogenic sources)[1]。如何区分沉积物中微量金属的自然含量与人为输入含量,进而评价微量金属污染程度一直是元素环境地球化学领域的难题。多数研究采用全球尺度或区域尺度地壳、土壤、沉积物等背景含量 Geochemical weathering and human activities can lead to the accumulation of trace amounts of toxic metals in sediments; the former is defined as geogenic sources and the latter is defined as anthropogenic sources [1]. How to differentiate the natural and trace amounts of trace metals in sediments and evaluate the degree of trace metal contamination has always been a problem in the field of elemental environmental geochemistry. Most studies use background content such as crust, soil, and sediments on a global or regional scale