A gravity core (220 cm depth) was collected to investigate the geochemistry, enrichment, and pollution of trace metals in anoxic sediments from San Simon Bay, an ecosystem of high biological productivity in the northwest of Spain. A five-step sequential extraction procedure was used. The Cu, Pb, and Zn contents decreased with depth, with maximum values in the top layers. Ni and Zn were bound to pyrite fractions, while Cd and Pb were associated with the most mobile fractions. The analyzed metals were associated with the fractions bound to organic matter, mainly with the strongly bound to organic matter fraction. High Cd and Cu values were observed. The fractionation showed a high mobility for Cd (28.3–100%) and Pb (54.0–70.2%). Moreover, the pollution factor and the geoaccumulation index reflected a high contamination for Pb and a moderate contamination for Cu and Zn in the superficial layers, pointing to a possible ecotoxicological risk to organisms in San Simon Bay.

中文翻译：

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圣西蒙湾沉积物中痕量金属的环境评估（西北伊比利亚半岛）

收集了一个重力岩心（深度为220厘米），以研究来自西班牙西北部具有高生物生产力的圣西蒙湾缺氧沉积物中微量金属的地球化学，富集和污染。使用了五步顺序萃取程序。Cu，Pb和Zn的含量随深度而降低，顶层中的最大值。Ni和Zn与黄铁矿级分结合，而Cd和Pb与最易移动的级分相关。分析的金属与结合到有机物上的部分有关，主要与牢固结合到有机物上的部分有关。观察到高的Cd和Cu值。分馏显示出Cd（28.3–100％）和Pb（54.0–70.2％）的高迁移率。此外，