Istituto Nazionale di Geofisica e Vulcanologia, sezione di Palermo, Palermo, Italy.
Water Res. 2011 Apr;45(9):3005-11. doi: 10.1016/j.watres.2011.03.028. Epub 2011 Mar 21.
We present a new device for continuous monitoring of the concentration of CO(2) dissolved in water. The device consists of a tube made of a polymeric semi-permeable membrane connected to an infrared gas analyser (IRGA) and a pump. Several laboratory experiments were performed to set the best operating condition and test the accuracy of measurements. We used the device for performing 20 months of continuous monitoring of dissolved CO(2) concentration (DCC) in groundwater within a drainage gallery at Mt. Etna. The monitored groundwater intercepts the Pernicana Fault, along which degassing is observed related to volcano-tectonic activity. The acquired data were compared with continuous and discrete data obtained using existing methods. The measurements of DCC resulted in some period of the year well correlated with air temperature. We also found that long-term trends, as well as short-term variations, are probably linked to the dynamics of volcanic activity and/or perturbations in the local or regional stress fields.
我们提出了一种用于连续监测水中溶解的 CO(2)浓度的新设备。该设备由一个连接到红外气体分析仪（IRGA）和一个泵的聚合物半透膜管组成。进行了多项实验室实验以确定最佳工作条件并测试测量精度。我们使用该设备在埃特纳山的排水画廊内对地下水中的溶解 CO(2)浓度（DCC）进行了 20 个月的连续监测。监测到的地下水截获了 Pernicana 断层，在此观测到与火山构造活动有关的脱气现象。所获得的数据与使用现有方法获得的连续和离散数据进行了比较。DCC 的测量结果在一年中的某些时期与空气温度密切相关。我们还发现，长期趋势以及短期变化可能与火山活动的动态和/或局部或区域应力场的干扰有关。
