Understanding and measuring groundwater gases

地下水溶解气体作为一种了解地下水地球化学的工具一直没有得到充分利用，部分原因是它们的采样和分析可能具有挑战性。地下水气体在地下水污染物的自然衰减中特别重要，因为许多期望的最终产物是气体（例如CO2、CH4和N2）。真正的溶解气体浓度估计依赖于准确的原位总溶解气体压力（TDGP）测量。TDGP的测量及其与“真正的”地下水天然气浓度估算相结合是相对较新的，准确的现场测量方法仍在开发中。这项提议的目标是提高地下水气体压力的精确测量，并利用这些改进的技术来更好地了解地下水气体沸腾和运输的控制。这将使地球化学反应（包括地下水污染物的自然衰减）的质量平衡更加稳定。

Dissolved groundwater gases have been under-utilized as a tool to understand groundwater geochemistry partly because their sampling and analysis can be challenging. Groundwater gases are particularly important in the natural attenuation of groundwater contaminants, since many of the desired end products are gases (e.g. CO2, CH4, and N2). True dissolved gas concentration estimates rely on accurate in situ measurement of total dissolved gas pressure (TDGP). The measurement of TDGP, and its incorporation into 'true' groundwater gas concentration estimation is relatively new, and accurate field measurement approaches are still in development. The goal of this proposal will be to improve accurate groundwater gas pressure measurement, and to use these improved techniques to better understand controls on groundwater gas ebullition and transport. This will permit more robust mass balances of geochemical reactions (including natural attenuation of groundwater contaminants).