Real-time analysis of volatile organic compounds (VOCs) in air is useful both for source identification and emissions compliance applications. In this work, two complementary triple quadrupole mass spectrometers, fitted with an atmospheric pressure chemical ionization (APCI) and a low pressure chemical ionization (LPCI) source, respectively, were deployed simultaneously to investigate emissions of VOCs associated with an Ontario-based chemical waste disposal facility. Mobile measurements performed upwind and downwind of the facility enabled selection of the best locations for stationary sampling. Seven separate field studies were undertaken between 2000 and 2016 to assess how emissions of VOCs have changed at the site as a function of time. Up to twenty-nine VOCs were successfully identified and quantified using MS/MS in each study. Simultaneous deployment of the two mass spectrometers enabled the detection of polar VOCs including alcohols, esters, amines and ketones as well as non-polar aromatic VOCs including benzene and naphthalene in real time. Concentrations of VOCs were found to decrease significantly in the vicinity of the facility over the sixteen year period, in particular since 2007. Concentration values for each year are compared with odour thresholds and provincial guidelines and implications of future expansion of on-site solid waste landfill volumes are also discussed.

空气中挥发性有机化合物（VOC）的实时分析对于源识别和排放合规性应用都非常有用。在这项工作中，同时部署了两个分别配有大气压化学电离（APCI）和低压化学电离（LPCI）源的互补三重四极杆质谱仪，以调查与安大略省化学废物相关的VOC排放处置设施。在设施的上，下风进行移动测量，可以选择最佳位置进行固定采样。在2000年至2016年之间进行了七次单独的现场研究，以评估现场的VOC排放随时间的变化情况。在每项研究中，使用MS / MS成功鉴定和定量了多达29种VOC。同时部署两个质谱仪可以实时检测包括醇，酯，胺和酮在内的极性VOC，以及包括苯和萘的非极性芳族VOC。发现在该设施附近（尤其是自2007年以来），该设施附近的VOC浓度在16年内显着下降。将每年的浓度值与气味阈值和省级指南进行比较，并对未来扩大现场固体垃圾填埋场的影响进行了比较。卷也进行了讨论。