Dioxin-like and estrogenic activity screening in fractionated sediments from a German catchment after the 2021 extreme flood

IF 6 3区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Sarah Johann, Moritz Düster, Piero Bellanova, Jan Schwarzbauer, Alexandra Weber, Stefanie Wolf, Holger Schüttrumpf, Frank Lehmkuhl, Henner Hollert
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Abstract

Background

The flood in July 2021 is considered one of the largest flood disasters in Western Europe in decades, with massive socio-economic consequences. The potential emission and remobilization of anthropogenic pollutants can lead to additional environmental consequences, which need to be addressed in long-term mitigation strategies. The Inde River and its tributary, the Vichtbach River, form a catchment located at the transition from the low mountain ranges of the Eifel to the lowlands of the Lower Rhine Embayment in Germany. The area has been an industrial and mining hotspot for centuries, making it a high-risk area for flood sediment pollution. The present study provides an ecotoxicological screening of flood sediments of the Vicht–Inde catchment to gain an impression of the degree of contamination by organic pollutants by means of in vitro effect-based method. Sediment samples were collected within days after the flood and fractionated prior to biotesting, and supportive instrumental geochemical analysis was performed.

Results

Flood sediments did not reveal estrogenic potential, which was included in the testing strategy as a relevant endpoint for industrial chemicals and untreated wastewater. In contrast, moderate-to-high dioxin-like activity was observed in 70% of the sediment samples with a peak dioxin-like potential at the restored section of the Inde. Overall, four hotspot samples were identified as at risk, which aligned mostly with the high concentration of organic pollutants including PAHs and PCBs. The fractionation allowed the identification of PAHs and their derivates as the most likely toxicity drivers for dioxin-like activity in the sediments of the Vicht–Inde catchment.

Conclusion

The results provide first information on the prioritization of hotspot locations at risk for a detailed ecotoxicological profiling and a post-flood monitoring of organic contamination. The identified sinks of contamination in the floodplain areas can be considered a source for remobilization of pollution in future flood events, which is highly relevant for the receiving Rur River.

Abstract Image

2021 年特大洪水后德国集水区分馏沉积物中的二恶英类和雌激素活性筛选
背景 2021 年 7 月的洪水被认为是西欧几十年来最大的洪水灾害之一,造成了巨大的社会经济后果。人为污染物的潜在排放和再移动会导致额外的环境后果,需要在长期缓解战略中加以解决。因德河及其支流维赫特巴赫河形成了一个集水区,位于德国埃菲尔低山脉向莱茵河下河口低地的过渡地带。几个世纪以来,该地区一直是工业和采矿业的热点地区,因此成为洪水沉积物污染的高风险区。本研究采用基于体外效应的方法,对维希特-因德集水区的洪水沉积物进行生态毒理学筛选,以了解有机污染物的污染程度。洪水过后几天内采集了沉积物样本,在进行生物测试前对样本进行了分馏,并进行了辅助性的仪器地球化学分析。相比之下,在 70% 的沉积物样本中观察到了中度到高度的二恶英类活性,在英德河恢复河段的二恶英类潜力达到峰值。总体而言,有四个热点样本被确定为存在风险,这主要与多环芳烃和多氯联苯等有机污染物的高浓度有关。通过分馏,可以确定多环芳烃及其衍生物最有可能是维赫特-因德河流域沉积物中二恶英类活性的毒性驱动因素。洪泛区已确定的污染汇可被视为未来洪水事件中污染再移动的源头,这与受纳鲁尔河高度相关。
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来源期刊
Environmental Sciences Europe
Environmental Sciences Europe Environmental Science-Pollution
CiteScore
11.20
自引率
1.70%
发文量
110
审稿时长
13 weeks
期刊介绍: ESEU is an international journal, focusing primarily on Europe, with a broad scope covering all aspects of environmental sciences, including the main topic regulation. ESEU will discuss the entanglement between environmental sciences and regulation because, in recent years, there have been misunderstandings and even disagreement between stakeholders in these two areas. ESEU will help to improve the comprehension of issues between environmental sciences and regulation. ESEU will be an outlet from the German-speaking (DACH) countries to Europe and an inlet from Europe to the DACH countries regarding environmental sciences and regulation. Moreover, ESEU will facilitate the exchange of ideas and interaction between Europe and the DACH countries regarding environmental regulatory issues. Although Europe is at the center of ESEU, the journal will not exclude the rest of the world, because regulatory issues pertaining to environmental sciences can be fully seen only from a global perspective.
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