IAS-CNR - National Research Council of Italy IAS - Institute of Anthropic Impacts and Sustainability in marine environment, Capo Granitola, Italy.
IAS-CNR - National Research Council of Italy IAS - Institute of Anthropic Impacts and Sustainability in marine environment, Lungomare Cristoforo Colombo 452, 90149 Palermo, Italy.
Chemosphere. 2020 Nov;258:127435. doi: 10.1016/j.chemosphere.2020.127435. Epub 2020 Jun 18.
Isotopic composition of mercury (Hg) in marine organisms and sediment cores was used to identify sources and reconstruct historical trends of contamination in the coastal-marine area of Rosignano Solvay (Italy), affected by Hg pollution from a chlor-alkali plant on the near land. Sediments show a wide range of Hg concentration and Hg isotope signatures. Particularly, coupled Hg concentration and δHg values trace inputs from different sources. The two depth-profiles clearly indicate three distinct periods: "pre-industrial" (before 1941), "industrial" (between 1941 and 2007) and "post-industrial" (after 2007) ages. This is also corroborated by sediment chronology, using Pb dating method, validated through Cs. Marine organisms are characterized by Hg isotope signatures comparable to "post-industrial" surface sediments. Notably, specimens of Mullus spp. evidence isotope composition comparable to the "industrial" sediments, thus suggesting a still active role of those sediments as source of Hg for the benthic fish compartment. The small amount of MIF and the ΔHg/ΔHg ratio recorded in organisms are reasonably consistent with limited processes of MMHg demethylation in the water column.
海洋生物和沉积物岩芯中的汞（Hg）同位素组成被用来识别罗西尼亚诺索拉维（意大利）沿海-海洋地区的污染来源，并重建其污染历史趋势，该地区受到附近氯碱厂 Hg 污染的影响。沉积物显示出广泛的 Hg 浓度和 Hg 同位素特征。特别是，Hg 浓度和 δHg 值的耦合可以追踪来自不同来源的输入。这两个深度剖面清楚地表明了三个不同的时期：“前工业化”（1941 年之前）、“工业化”（1941 年至 2007 年之间）和“后工业化”（2007 年之后）。这也得到了使用 Pb 测年法验证的 Cs 确定的沉积物年代学的支持。海洋生物的 Hg 同位素特征与“后工业化”表层沉积物相似。值得注意的是，Mullus spp. 的标本显示出与“工业”沉积物相似的同位素组成，这表明这些沉积物仍然是底栖鱼类中 Hg 的来源。在生物体中记录到的少量 MIF 和 ΔHg/ΔHg 比值与水柱中 MMHg 脱甲基化的有限过程相当一致。
