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

天然纳米颗粒(NNP)和土生胶体作为元素在生态系统水相中高度相关的传输形式正日益被人们所认识。这种粒子的元素组成以及它们的大小范围以前已经被研究过，但关于它们的时间动力学和起源仍然缺乏重要的基本信息。本研究项目的目的是(I)阐明河流生态系统中NNP和胶体的时间动态，(Ii)评估洪峰事件对NNP和胶体输运的影响，(Iii)确定溪水NNP和胶体的潜在来源。为了了解(Iv)不同生态系统研究结果的大陆有效性，将对来自欧洲不同流域的监测良好的溪流样本进行分析，这些溪流提供土壤、水化学和通量的数据，我可以在那里建立第一个自己的科学合作。样品将使用联用场流分馏(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定分析将与木质素衍生的苯酚、13C自然丰度跟踪、放射性碳测年和额外的d56Fe分析相结合。通过组合数据，应该可以更好地理解NNP和胶体作为元素的主要运输形式的存在和变化，它们来自不同的土层，并对我的发现在整个欧洲不同地点的总体有效性进行评级。

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.