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首页> 外文期刊>E3S Web of Conferences >Natural background values for heavy metals in the sediments of a contaminated Northern Adriatic lagoon environment: a geochemical perspective
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Natural background values for heavy metals in the sediments of a contaminated Northern Adriatic lagoon environment: a geochemical perspective

机译：受污染的北亚得里亚泻湖环境沉积物中重金属的自然本底值：地球化学观点

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摘要

Major and trace elements were determined in 14 sediment cores collected from the Marano and Grado Lagoon (northern Adriatic sea). The lagoon is contaminated by several harmful priority substances, heavy metals included, and it has also been declared a “polluted site of national interest” (SIN) mainly due to high Hg concentrations in sediments. Based on a normalization procedure involving predicted linear relationships for “metal vs Al” obtained from the core subsamples, background values for each metal were evaluated on a regional scale and according to the grain-size variability. Compared to Environmental Quality Standards reported in the Italian laws and regulations, the estimated background ranges show that bottom sediments are naturally “enriched” in some metals, such as Cr, Ni and Cd especially in sediments with a high percentage of the fine component. A correct evaluation on sediment quality status should be made on the basis of regional background values for each metal, taking into account local geochemical characteristics, i.e. mineralogical composition and grain-size variability of sediments.Key words: Heavy metals / normalization procedure / background / coastal sediments / Environmental Quality Standards
机译：确定了从Marano和Grado泻湖（北亚得里亚海）收集的14个沉积岩心中的主要和微量元素。泻湖被几种有害的优先物质（包括重金属）污染，也被宣布为“国家利益污染场所”（SIN），主要是由于沉积物中汞含量高。基于涉及从核心子样品获得的“金属与铝”的预测线性关系的归一化程序，在区域范围内并根据晶粒尺寸变异性评估了每种金属的背景值。与意大利法律和法规中报告的《环境质量标准》相比，估算的背景范围显示，某些金属（例如Cr，Ni和Cd）的底部沉积物自然“富集”，尤其是细成分含量较高的沉积物中。应根据每种金属的区域背景值，并考虑当地地球化学特征，即沉积物的矿物学组成和粒度变异性，对沉积物质量状况做出正确的评估。关键词：重金属/正火程序/背景/沿海沉积物/环境质量标准

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