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Trace elements in coralline algae as a new proxy for seawater chemistry and metal pollution
Chemical Geology ( IF 3.9 ) Pub Date : 2024-03-08 , DOI: 10.1016/j.chemgeo.2024.122026
Jean-Alix Barrat , Laurent Chauvaud , Erwan Amice , Jacques Grall , Marie-Laure Rouget , Germain Bayon , Yoan Germain

The abundances of some macronutrients, and trace elements (K, Al, P, V, Mn, Co, Ni, Cu, Zn, Rb, Sr, Mo, Cs, Ba, Pb, Th, U, Y and REE) were determined in a series of coralline algae () samples ( = 101) collected alive in the Bay of Brest and the Iroise Sea (Western Brittany, NW France), in order to assess the potential of these algae as archives of seawater chemistry and potential metal pollution. REE and Y (REY) patterns are similar in shape to those of local seawater, exhibiting similar La, Ce and Y anomalies, but with abundances ranging between 4 and 5 orders of magnitude higher than seawater values. Variations in La anomalies (La/La* = 1.29–2.08), Y anomalies (Y/Ho = 38.6–55.8), and heavy rare earth enrichments (Pr/Er = 0.22–0.52) are consistent with mixing of seawater with rivers flowing into the Bay of Brest. The behavior of other trace elements, such as Al and Cs, also reflects this mixing. Other parameters and processes can control the abundances of the other elements measured. For example, the presence of organic matter in studied samples controls the abundances of K and Rb. The abundances of base metals (e.g., Co, Ni, Cu) are highly sensitive to the various pollutants present in the Bay of Brest. In particular, the Pb content of coralline algae clearly reflects the pollution caused by mining of a nearby Pb deposit from the 18th to the early 20th century. Our results demonstrate the potential of coralline algae not only for tracing water masses, but also for studying metal pollution.

中文翻译:

珊瑚藻中的微量元素作为海水化学和金属污染的新指标

测定了一些常量营养素和微量元素(K、Al、P、V、Mn、Co、Ni、Cu、Zn、Rb、Sr、Mo、Cs、Ba、Pb、Th、U、Y 和 REE)的丰度在布雷斯特湾和伊鲁瓦兹海(法国西北部布列塔尼西部)活体收集的一系列珊瑚藻 () 样本 ( = 101) 中,以评估这些藻类作为海水化学和潜在金属污染档案的潜力。 REE 和 Y (REY) 模式在形状上与当地海​​水相似,表现出类似的 La、Ce 和 Y 异常,但丰度范围比海水值高 4 到 5 个数量级。 La 异常 (La/La* = 1.29–2.08)、Y 异常 (Y/Ho = 38.6–55.8) 和重稀土富集 (Pr/Er = 0.22–0.52) 的变化与海水与河流的混合一致。进入布雷斯特湾。其他微量元素(例如 Al 和 Cs)的行为也反映了这种混合。其他参数和过程可以控制其他测量元素的丰度。例如,研究样品中有机物的存在控制着 K 和 Rb 的丰度。贱金属(例如钴、镍、铜)的丰度对布雷斯特湾存在的各种污染物高度敏感。特别是珊瑚藻中的铅含量清楚地反映了18世纪至20世纪初附近铅矿开采所造成的污染。我们的结果证明了珊瑚藻不仅具有追踪水团的潜力,而且还具有研究金属污染的潜力。
更新日期:2024-03-08
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