Université de Lorraine, CNRS, LRGP, F-54000 Nancy, France.
Université de Lorraine, CNRS, LIEC, F-57000 Metz, France.
Sci Total Environ. 2020 Nov 10;742:140619. doi: 10.1016/j.scitotenv.2020.140619. Epub 2020 Jul 1.
Anthropogenic activities linked to various new technologies are increasingly disrupting REEs biogeochemical cycles. A catchment-based perspective is therefore necessary to distinguish between natural (i.e., changes in lithology) and human-related sources of REEs variability. In the present study, REEs patterns, anomalies and fluxes were investigated in the French part of the Moselle River basin (Moselle River itself and some of its headstreams and tributaries). The REEs patterns in the headstream waters were highly variable and mostly related to the complex underlying lithology (granite, sandstone, tuff and graywacke). Along the Moselle River, the presence of positive Gd anomalies and a regular LREEs depletion/HREEs enrichment pattern on sandstone/limestone substrates were the most distinctive features. The Gd anomaly varied from 1.8 to 8.7, with anthropogenic Gd representing 45 to 88% of the total Gd. A linear relationship was obtained between the anthropogenic Gd flux and the cumulative population along the watershed. However, the magnitude of the Gd anomalies was shown to depend on the methodological approach chosen for their calculation. The use of a threshold value to identify the presence of an anthropogenic Gd anomaly may therefore be basin (and lithology) dependent, and care has to be taken in comparing results from different rivers or lithologies. Concentration of anthropogenic Gd in the Moselle River and its tributaries were close to, or above, the value of 20 ng/L reported in literature to elicit adverse biological effects in laboratory cell cultures. The ecotoxicological significance of Gd anomalies deserves further investigation because concentrations of anthropogenic Gd may also vary depending on the methodological approach used for calculating Gd anomalies.
人为活动与各种新技术有关，这些活动正日益破坏稀土元素的地球化学循环。因此，有必要从集水区的角度来区分稀土元素变化的自然（即岩性变化）和人为来源。本研究调查了法国摩泽尔河流域（摩泽尔河本身及其一些源头和支流）的稀土元素模式、异常和通量。源头水的稀土元素模式变化很大，主要与复杂的基底岩性（花岗岩、砂岩、凝灰岩和杂砂岩）有关。在摩泽尔河上，存在正的 Gd 异常和砂岩/石灰岩基质上规则的轻稀土元素（LREEs）亏损/重稀土元素（HREEs）富集模式是最显著的特征。Gd 异常值范围从 1.8 到 8.7，人为 Gd 占总 Gd 的 45%到 88%。在流域范围内，人为 Gd 通量与累积人口之间存在线性关系。然而，Gd 异常的大小取决于用于计算的方法。因此，为了确定人为 Gd 异常的存在而使用阈值值可能会受到流域（和岩性）的影响，在比较来自不同河流或岩性的结果时需要小心。摩泽尔河及其支流中人为 Gd 的浓度接近或高于文献中报道的 20ng/L，这会在实验室细胞培养中引发不良的生物学效应。Gd 异常的生态毒理学意义值得进一步研究，因为人为 Gd 的浓度也可能因用于计算 Gd 异常的方法而异。
