Yang Ji-Won, Cho Hyun-Jeong, Lee Sang-Hyun, Lee Jae-Young
Environmental Remediation Engineering Laboratory, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Guseong-dong, Yuseong-gu, Daejon, Republic of Korea.
Environ Monit Assess. 2004 Mar;92(1-3):153-61. doi: 10.1023/b:emas.0000014500.49791.77.
A Figaro-type gas sensor system was investigated for the monitoring of volatile organic contaminants (VOC) in the exhaust gas from a soil vapor extraction (SVE) process. Benzene, toluene, ethyl benzene and xylene (BTEX), and their mixtures, were tested as representative contaminants. Reasonably good correlation factors >0.98 were obtained between the GC analyses and the sensor responses for each component, and for the total gas concentrations. Although the composition of the exhaust gas from SVE process, as well as the amount of each component, change with time, the sensor can be used to estimate the residual amount of contaminants by measuring the total concentrations in the exhaust gas. The sensor can be utilized as a valuable tool for the monitoring of SVE process by indicating when the operation to remediate a contaminated site should be stopped. The proposed ceramic gas sensor system may be a good alternative to existing methods, because it can satisfy the essential monitoring necessities of SVE processes, and has many advantages over other fully equipped instrumentation, as a cost-effective device, with long-term monitoring stability.
研究了一种费加罗型气体传感器系统，用于监测土壤气相抽提（SVE）过程废气中的挥发性有机污染物（VOC）。以苯、甲苯、乙苯和二甲苯（BTEX）及其混合物作为代表性污染物进行了测试。对于每种组分以及总气体浓度，气相色谱分析与传感器响应之间获得了大于0.98的合理良好相关系数。尽管SVE过程废气的组成以及各组分的含量会随时间变化，但该传感器可通过测量废气中的总浓度来估算污染物的残留量。该传感器可作为一种有价值的工具，通过指示何时应停止修复受污染场地的操作来监测SVE过程。所提出的陶瓷气体传感器系统可能是现有方法的一个很好的替代方案，因为它可以满足SVE过程的基本监测需求，并且作为一种具有长期监测稳定性的经济高效设备，相对于其他全功能仪器具有许多优势。
