Anthropogenic activities linked to various new technologies are increasingly disrupting REE biogeochemical cycles. A catchment-based perspective is therefore necessary to distinguish between natural (i.e., changes in lithology) and human-related sources of REE variability. In the present study, REE 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 REE 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 LREE depletion/HREE 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.

与各种新技术相关的人为活动正日益破坏REE生物地球化学循环。因此，以流域为基础的观点对于区分自然（即岩性变化）和与人类有关的REE变异性来源很有必要。在本研究中，对摩泽尔河流域法国部分（摩泽尔河本身及其部分上游和支流）的REE模式，异常和通量进行了调查。上游水域的稀土元素形态变化很大，并且主要与复杂的岩性（花岗岩，砂岩，凝灰岩和灰泥岩）有关。沿着摩泽尔河，砂岩/石灰岩基质上存在正Gd异常和规则的LREE耗尽/ HREE富集模式。Gd异常范围从1.8到8.7，人为的Gd占总Gd的45％至88％。人为的Gd通量与沿流域的累积种群之间存在线性关系。但是，显示出Gd异常的幅度取决于为计算选择的方法学方法。因此，使用阈值来识别人为Gd异常的存在可能取决于盆地（和岩性），在比较不同河流或岩性的结果时必须格外小心。摩泽尔河及其支流中人为造成的Gd浓度接近或高于文献中报道的20 ng / L的值，从而在实验室细胞培养中引起不利的生物学影响。