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Developing and Testing a Robust and Reliable Field Method for In-Situ Analysis of Dissolved Gases in Streams

开发和测试一种稳健可靠的现场方法，用于流中溶解气体的原位分析

基本信息

批准号：
319532957
负责人：
Professor Dr.-Ing. Olaf A. Cirpka
金额：
--
依托单位：
Earth Surfaces Processes Division
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/319532957?language=en
关键词：
Developing Testing Robust Reliable Field

项目摘要

Reliably measuring dissolved concentrations of major and trace gases enables assessing the dynamics of water fluxes and biochemical turnover in aquatic systems. We want to establish a robust and reliable method for on-site gas-tracer measurements and continuous gas monitoring in rivers using a gas-equilibrium membrane inlet mass spectrometer capable of measuring concentrations of dissolved gases in a quasi-continuous manner. We further want to develop a consistent method for the determination of reaeration rate coefficients in streams using the mentioned field gas analyzer to determine the loss of dissolved gas tracers and the concentration of dissolved oxygen in streams and the hyporheic zone. Towards this ends we will adapt the instrument for gas-tracer tests in streams and test the applicability of different gas tracer compounds (namely noble gases and propane), conduct and evaluate gas-tracer tests in streams close to Tübingen, and adapt the method for small water volumes to make the application together with mini piezometers in the streambed feasible. The reliable measurements of injected gas tracers and dissolved oxygen will help to disentangle the interacting processes of gas-exchange, photosynthesis, and aerobic metabolism of dissolved oxygen in streams.

可靠地测量主要和微量气体的溶解浓度，可以评估水通量和水生系统中的生物化学周转的动态。我们希望建立一个强大的和可靠的方法，现场气体示踪剂测量和连续气体监测河流中使用的气体平衡膜入口质谱仪能够测量溶解气体的浓度在一个准连续的方式。我们还希望开发一种一致的方法，用于使用上述现场气体分析仪确定流中的复氧率系数，以确定溶解气体示踪剂的损失以及流和潜流区中溶解氧的浓度。为此，我们将调整仪器用于溪流中的气体示踪剂测试，并测试不同气体示踪剂化合物（即惰性气体和丙烷）的适用性，在图宾根附近的溪流中进行和评估气体示踪剂测试，并调整方法用于小水量，以使与小型压力计一起应用在河床中可行。注入的气体示踪剂和溶解氧的可靠测量将有助于解开气体交换，光合作用，溶解氧的好氧代谢流中的相互作用过程。