易挥发有机化合物(VOCs)的来源广泛且参与大气光化学反应,是光化学污染物的主要前体物,也是影响 城市和区域大气质量的重要污染物,工业生产过程中多点源、面源和无组织源排放的VOCs是其重 要来源。对于多点源、无组织排放源,其所包含的各种污染排放情况复杂且存在较多未知因素,一直 缺乏便捷和快速的监测手段。利用车载掩日法通量遥测技术(SOF-FTIR),以太阳直射光的红外辐 射作为接收光源,快速扫描工厂污染区域并进行实时的气体泄漏监测,具有结构轻便、便于移动测量、 可进行多组分、低浓度、远距离遥测等优点。实验分析表明,该方法可快速大范围地对化工厂区的VOCs排放 进行监测并给出其时空分布情况,可为试验地区相关的环保决策提供有效的数据支持。

Volatile organic compounds (VOCs), which participate in photochemical reactions and come from a variety of sources, are main precursor of photochemical pollution, and also the critical pollutants that currently affect Chinese urban air quality. Multi-point source, plane source and unorganized emissions source of industrial production process are significant sources of them. The pollution situation is complex and has many unknown factors, so the convenient and fast monitoring measurement is lacking. The technology of solar occultation flux based on FTIR(SOF-FTIR)is used, which takes advantage of infrared radiation of direct sunlight, rapid scanning factory pollution area and real-time monitoring. This method with convenient operation and high maneuverability, can be used to analyze multicomponent samples with low concentration. Experimental analysis indicates that, this method can monitor the VOCs emission of chemical plant, give out its time and space distribution features rapidly, which will provide effective data support for environmental decision-making.