Natural nanoparticles and colloids in European forested headwater catchments: new insights on spatiotemporal dynamics and potential origin

欧洲森林源头集水区的天然纳米粒子和胶体：关于时空动力学和潜在起源的新见解

• 批准号: 354742818
• 负责人: Dr. Melanie Braun, since 6/2020
• 金额: --
• 依托单位: Eidgenössische Forschungsanstalt WSL - Wald-Schnee-Landschaft
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/354742818?language=en
• 关键词: Natural; nanoparticles; colloids; European; forested

Natural nanoparticles (NNP) and soil-born colloids are being increasingly recognized as highly relevant transport form of elements in aqueous phases of ecosystems. The elemental composition of such particles as well as their size ranges has been previously studied, yet important fundamental information is still lacking regarding their temporal dynamics and origin. The aims of this research project are (i) to elucidate the temporal dynamics of NNP and colloids in stream water ecosystems, (ii) to assess the influence of peak flow events on the export of NNP and colloid mediated transport, (iii) to identify the potential origin of stream water NNP and colloids. To obtain an idea on (iv) continental validity of the findings for different ecosystems, the analyses will be performed on samples from well-monitored streams from different catchments in Europe, which provide data on soils, water chemistry and fluxes, and where I could already establish first own scientific collaborations. Samples will be analyzed with hyphenated Field Flow Fractionation (FFF) and, for selected samples, size-resolved and element-specific analysis of NNP and colloids is combined with the analyses of lignin-derived phenol, 13C natural abundance tracing, radiocarbon dating and additional d56Fe analyses. Through the combined data, it should be possible to better understand the occurrence and variability of NNP and colloids as predominant transport form of elements, their origin from different soil horizons as well as to rate the general validity of my findings for different site locations across Europe.

天然纳米粒子（NNP）和土生胶体越来越被认为是生态系统水相中元素高度相关的运输形式。先前已经研究过此类粒子的元素组成及其尺寸范围，但仍缺乏关于其时间动力学和起源的重要基本信息。该研究项目的目的是（i）阐明溪流水生态系统中 NNP 和胶体的时间动态，（ii）评估峰值流量事件对 NNP 输出和胶体介导的运输的影响，（iii）确定溪流水 NNP 和胶体的潜在来源。为了了解（iv）不同生态系统的研究结果在大陆上的有效性，将对来自欧洲不同流域的监测良好的溪流样本进行分析，这些样本提供了土壤、水化学和通量的数据，并且我已经可以在其中建立第一个自己的科学合作。样品将采用联用场流分级 (FFF) 进行分析，对于选定的样品，NNP 和胶体的尺寸分辨和元素特异性分析将与木质素衍生酚的分析、13C 自然丰度追踪、放射性碳测年和其他 d56Fe 分析相结合。通过综合数据，应该可以更好地了解作为元素主要传输形式的 NNP 和胶体的出现和变异性、它们来自不同土壤层的起源，以及评估我的研究结果在欧洲不同地点的普遍有效性。