The Role of Molecular Dissolved Organic Matter (DOM) Composition to Identify Sources and Release of DOM and Trace Elements in Catchments of Drinking Water Reservoirs in Mid-Latitude Mountain Areas – (DOMtrace)A Solid Phase Analytic Pyrolysis (Py-GC-MS, TH

北方温带地区表层沃茨中溶解有机物（DOM）浓度增加的证据正在迅速积累。这在很大程度上归因于从集水土壤，特别是泥炭沉积物的有机质加速腐烂，以及随后DOM通过溪流和河流进入湖泊和水库的运输增加DOM释放。DOM除了对全球碳循环和气候预测的重要性外，DOM对饮用水水库的“布朗宁”还带来了沿着许多环境问题和管理问题，如饮用水水质下降、化学品费用增加和重金属污染增加等。尽管DOM质量是DOM动力学的关键参数之一，但其分子组成及其与土地利用、集水区植被、泥炭水文学或重金属迁移的关系还很难了解。此外，山区泥炭地和森林土壤经常受到重金属（Pb、Hg、Zn等）的污染。和砷的污染。我们建议在哈茨山（Eckertalstausee）及其集水区，DOM增加的现象已经认识到几年的饮用水水库的研究。尽管人们普遍认为DOM排放量的增加与泥炭分解有关，但没有直接证据表明泥炭是DOM和重金属的主要来源。我们建议监测的DOM的分子组成的Eckerstausee水库，其主要支流，Ecker流，和其他几个流排水泥炭地或土壤下针叶林，为期12个月。我们的目标是了解DOM负载的季节性和空间变异性，它的来源和它的作用作为载体的微量元素的分子DOM组成的函数。与其他研究不同的是，DOM组成分析将侧重于固相热解-GC-MS和热辅助水解和甲基化-GC-MS测量，并辅以光谱方法和微量元素分析。因此，该建议将有助于填补我们对DOM的生物地球化学循环的知识空白，特别是利用Eckertalstausee作为天然实验室，确定DOM的主要供应商和饮用水水库的痕量污染物

Evidence of increasing concentrations of dissolved organic matter (DOM) in the surface waters of temperate regions of the Northern Hemisphere is rapidly accumulating. This is largely ascribed to enhanced DOM release from accelerated decay of organic matter from catchment soils, in particular peat deposits, and subsequent DOM transport through streams and rivers into lakes and reservoirs. Besides the importance of DOM for the global carbon cycle and climate projections, "browning" of drinking water reservoirs by DOM brings along many environmental problems and issues related to management, such as declining quality of drinking water, increased expenses on chemicals and increases in heavy metal contamination. Even though DOM quality is one of the key parameters in DOM dynamics, its molecular composition and its relation to land-use, vegetation of the catchment, peat hydrology or heavy metal transport are hardly understood. Moreover, peatlands and forest soils in mountainous areas are often contaminated by heavy metals (Pb, Hg, Zn etc.) and arsenic as a result of centuries of mining activities. We propose research on a drinking water reservoir in the Harz Mountains (Eckertalstausee) and its catchment, where the phenomenon of DOM increase has been recognized for several years now. Even though it is generally assumed that the elevated DOM discharge is associated with peat decomposition, direct evidence of peat as the major DOM and heavy metal source is not available. We propose to monitor the molecular composition of the DOM in the Eckerstausee reservoir, its main tributary, the Ecker stream, and several other streams that drain either peatlands or soils under coniferous forests, for a period of 12 months. We aim to understand the seasonal and spatial variability in DOM load, its sources and its role as a vehicle for trace elements as a function of the molecular DOM composition. Different from other studies DOM composition analyses will focus on solid phase Pyrolyse-GC-MS and Thermally assisted Hydrolysis and Methylation -GC-MS measurements supported by spectroscopic methods and trace element analyses. Hence, this proposal will contribute to filling a gap in our knowledge on the biogeochemical cycle of DOM, more particularly to identify the main suppliers of DOM and trace pollutants to drinking water reservoirs, using the Eckertalstausee as a natural laboratory