Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China; University of Science and Technology of China, Hefei, 230026, China.
Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
Environ Pollut. 2020 Oct;265(Pt B):114628. doi: 10.1016/j.envpol.2020.114628. Epub 2020 May 1.
Volatile organic compounds (VOCs) are important precursors of ozone (O) and secondary organic aerosols (SOAs). Tracing VOC pollution sources is important for controlling VOC emissions and reducing O and SOAs. We built a novel mobile proton transfer reaction mass spectrometry (M-PTR-MS) instrument to image the distribution of VOCs and trace their emission sources in cities and industrial parks. The M-PTR-MS is composed of a vibration-resistant proton transfer reaction mass spectrometry (PTR-MS) with a global positioning system receiver, modified box vehicle, and geographic information system (GIS) software. The PTR-MS, mounted on a vehicle, sends VOC data and vehicle position information to the GIS software. These data are used to image the space distribution of VOCs in real time while the vehicle platform is in motion and the VOC sources are precisely traced using the GIS. The spatial data resolution of the M-PTR-MS is typically 0.8 m. The limits of detection, sensitivity, and repeatability of the M-PTR-MS are 43.5 ppt, 347 counts ppb, and 2.4% (RSD, n = 5), respectively. The intensity of reagent ions is stable over 8 h (RSD = 0.45%). Compared with commercial PTR-MS equipment, the M-PTR-MS demonstrated high consistency, with a correlation coefficient of 92.665%. Several field experiments were conducted in China using the M-PTR-MS. In one field experiment, the VOC distribution along three different routes was surveyed; the navigation monitoring lasted 1.8 h over a distance of 26.7 km at an average speed of 15 km h. The VOC sources in an industrial park were identified by analyzing the components near different factories. The main species from a VOC source in an underground garage was related to paint. The M-PTR-MS instrument can be used by environmental protection agencies to trace VOC pollution sources in real time, and by researchers to survey VOC emissions in regions of concern.
挥发性有机化合物（VOCs）是臭氧（O）和二次有机气溶胶（SOAs）的重要前体。追踪 VOC 污染来源对于控制 VOC 排放、减少 O 和 SOAs 至关重要。我们构建了一种新型的移动质子转移反应质谱仪（M-PTR-MS），用于成像城市和工业园区中 VOC 的分布并追踪其排放源。M-PTR-MS 由带全球定位系统接收器的抗振质子转移反应质谱仪（PTR-MS）、改装的箱式车辆和地理信息系统（GIS）软件组成。车载 PTR-MS 将 VOC 数据和车辆位置信息发送到 GIS 软件。这些数据用于在车辆行驶时实时成像 VOC 的空间分布，并使用 GIS 精确追踪 VOC 源。M-PTR-MS 的空间数据分辨率通常为 0.8 m。M-PTR-MS 的检出限、灵敏度和重复性分别为 43.5 ppt、347 计数 ppb 和 2.4%（RSD，n = 5）。试剂离子强度在 8 h 内保持稳定（RSD = 0.45%）。与商用 PTR-MS 设备相比，M-PTR-MS 具有较高的一致性，相关系数为 92.665%。在中国进行了多次现场实验，使用 M-PTR-MS 对三条不同路线的 VOC 分布进行了调查；导航监测持续 1.8 h，行驶距离 26.7 km，平均速度为 15 km h。通过分析不同工厂附近的成分，确定了工业园区的 VOC 源。地下车库 VOC 源的主要物质与油漆有关。M-PTR-MS 仪器可用于环保部门实时追踪 VOC 污染来源，也可用于研究人员调查关注区域的 VOC 排放。
