Department of Biological and Environmental Engineering, Semyung University, Jecheon-si 27136, Korea.
Department of Civil and Environmental Engineering, Hongik University, Seoul 04066, Korea.
Int J Environ Res Public Health. 2022 Mar 14;19(6):3400. doi: 10.3390/ijerph19063400.
Subsurface VOC monitoring has been mainly based on manual sampling, transport, and analysis, which would require a sufficient amount of samples to ensure data accuracy and reliability, and additional costs to ensure sample quality. Therefore, a continuous on-site monitoring system is desirable for accurate measurement and subsequent risk assessment. In this study, benzene, toluene, ethylbenzene, and xylene (BTEX) were continuously monitored by the system based on a thermal desorber (TD) and gas chromatography (GC) in an oil-contaminated site that consisted of saturated and unsaturated zones. For the saturated zone, fully automated groundwater sampling and purging processes were performed, and the gasified samples were applied to the TD-GC system. For the unsaturated zone, the gaseous sample in the site was directly applied to the TD-GC system. After verifying the accuracy and precision of the monitoring system, the continuous monitoring system was successfully operated for more than a month in the field. The monitoring system used in this study is applicable to other sites for continuous monitoring, thus providing a scientific background for advanced risk assessment and policy development.
地下挥发性有机化合物监测主要基于手动采样、运输和分析，这需要足够数量的样本以确保数据的准确性和可靠性，并需要额外的成本来确保样本质量。因此，对于准确测量和后续风险评估，需要一个连续的现场监测系统。在本研究中，基于热解吸（TD）和气相色谱（GC）的系统连续监测了包含饱和区和不饱和区的污染场地中的苯、甲苯、乙苯和二甲苯（BTEX）。对于饱和区，进行了全自动地下水采样和冲洗过程，将气化的样品应用于 TD-GC 系统。对于不饱和区，将现场的气态样品直接应用于 TD-GC 系统。在验证监测系统的准确性和精密度之后，该连续监测系统在现场成功运行了一个多月。本研究中使用的监测系统适用于其他连续监测的场地，为先进的风险评估和政策制定提供了科学依据。
