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Multi-Gas Analysis of Atmospheric Sulfur Gases by Means of Microscrubber and its Application to Dynamics Analysis at Tidal Flat

微洗涤器对大气含硫气体的多气体分析及其在滩涂动力学分析中的应用

基本信息

批准号：
15550075
负责人：
TODA Kei
金额：
$ 2.56万
依托单位：
Kumamoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Microchannel scrubber was developed for wet chemical gas analysis system. The scrubber developed had high surface-to-volume ratio and gave high collection-concentration efficiency. The microchannel scrubbers were combined with fluorescence and conductivity micro detectors and pneumatic liquid supply system to present a totally miniaturized gas analysis system. We call it micro Gas Analysis System (μGAS). In order to use the system outside in the field, we developed a liquid-flow methods and micro liquid flow sensor. Furthermore, feedback control of electroosmotic flow was performed with the flow sensor. H_2S and SO_2 are the important volcanic gases, but there are few reports for the both gases. Using this device we developed, long-term monitoring and mobile monitoring of the volcanic gases were performed, and useful information of relationship between volcano activity and volcanic gases were obtained. We investigated sulfur gas emission from tidal flat sediment at Ariake Sea. Effect of sediment characteristics, daily variation and seasonal variation of the gas emissions were investigated. This report presented a important proposal about the sulfur cycle occurring in the earth. The technique developed for the gas analysis we developed has been applied to analysis of trace dissolving species with coupling with the vaporization method. Also we applied our technique to breath analysis, such as H_2S, NH_3 and acetone.

针对湿化学气体分析系统，研制了微通道洗涤器。所研制的洗涤器具有高的比表面积和高的收集浓缩效率。将微通道洗涤器与荧光和电导微检测器以及气动供液系统相结合，构成了一个完全小型化的气体分析系统。我们称之为微型气体分析系统（μGAS）。为了将该系统应用于野外，我们开发了液流测量方法和微型液流传感器。此外，电渗流的反馈控制与流量传感器进行。H_2S和SO_2是重要的火山气体，但对这两种气体的研究报道较少。利用该装置对火山气体进行了长期监测和移动的监测，获得了火山活动与火山气体关系的有用信息。研究了有明海潮滩沉积物中含硫气体的释放。研究了沉积物特性、气体排放量的日变化和季节变化对排放量的影响。该报告对地球硫循环提出了重要建议。本文所发展的气体分析技术已应用于与蒸发法联用的痕量溶解组分分析。并将该技术应用于呼吸气体的分析，如H_2S、NH_3和丙酮。