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

分子溶解有机物 (DOM) 成分在识别中纬度山区饮用水水库集水区 DOM 和微量元素的来源和释放中的作用 â (DOMtrace)A 固相分析热解 (Py-GC-MS , TH

基本信息

批准号：
419258863
负责人：
Professor Dr. Harald Biester, Ph.D.
金额：
--
依托单位：
Abteilung Geochemie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2019
资助国家：
德国
起止时间：
2018-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/419258863?language=en
关键词：
Role Molecular Dissolved Organic Matter

项目摘要

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

北半球温带地区地表水中溶解有机物（DOM）浓度不断增加的证据正在迅速积累。这主要归因于流域土壤（特别是泥炭沉积物）中有机物质加速腐烂导致的 DOM 释放增加，以及随后 DOM 通过溪流和河流进入湖泊和水库。除了DOM对全球碳循环和气候预测的重要性之外，DOM对饮用水水库的“褐变”还带来了许多环境问题和与管理相关的问题，例如饮用水质量下降、化学品费用增加和重水增加。金属污染。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、流域植被、泥炭水文学或重金属迁移的关系却很难被了解。此外，由于几个世纪的采矿活动，山区的泥炭地和森林土壤经常受到重金属（铅、汞、锌等）和砷的污染。我们建议对哈尔茨山脉 (Eckertalstausee) 及其流域的饮用水水库进行研究，其中 DOM 增加的现象几年前已被认识到。尽管人们普遍认为 DOM 排放量升高与泥炭分解有关，但仍没有泥炭作为主要 DOM 和重金属来源的直接证据。我们计划在 12 个月的时间内监测 Eckerstausee 水库、其主要支流、Ecker 河以及其他几条排出泥炭地或针叶林下土壤的溪流中 DOM 的分子组成。我们的目标是了解 DOM 负荷的季节和空间变化、其来源及其作为微量元素载体的作用（作为分子 DOM 组成的函数）。与其他研究不同，DOM 成分分析将重点关注光谱方法和痕量元素分析支持的固相热解-GC-MS 和热辅助水解和甲基化-GC-MS 测量。因此，该提案将有助于填补我们在 DOM 生物地球化学循环方面的知识空白，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微量污染物