Karellas N S, Chen Q F, De Brou G B, Milburn R K
Ontario Ministry of the Environment, Environmental Monitoring & Reporting Branch, Air Monitoring Section, 125 Resources Road, Toronto, Ont, Canada M9P 3V6.
J Hazard Mater. 2003 Aug 15;102(1):105-20. doi: 10.1016/s0304-3894(03)00205-x.
On 9 August 2000 a fire started at a facility that manufactures pool chemicals in Guelph, Ontario. A mobile trace atmospheric gas analyzer (TAGA) unit was summoned to provide on-site air monitoring operated by the Ontario Ministry of the Environment (OMOE). The responsibility of the TAGA unit was to monitor in real time the airborne contaminants released through the combustion of pool chemicals. This was accomplished by using an atmospheric pressure chemical ionization (APCI) source with the newest TAGA (model IIe): a triple quadrupole mass spectrometer which allows for the direct sampling and real time analysis of air for a wide range of toxics at low parts-per-billion (ppb) levels. The ionization mechanism under negative APCI conditions is dominated by charge transfer reactions, yielding parent ions which are selected in Q1, dissociated in Q2 and the resultant daughter ions are identified in Q3. By monitoring specific parent/daughter (P/D) ion pairs, the TAGA IIe was able to simultaneously measure, in real time, levels of hydrogen chloride (HCl) and chlorine (Cl2) present in the air. The response of the TAGA IIe was characterized by multi-point calibration curves which were linear up to 250 microg/m3 for HCl and up to 600 microg/m3 for Cl2. The average detection limit (DL) for this application was 0.50 microg/m3 for both HCl and Cl2. On-site measurements of HCl and Cl2 were made at several locations upwind and downwind of the fire site over a period of 3 days. The data collected by the TAGA unit was used by the local officials for a real time assessment of the airborne levels of HCl and Cl2.
2000年8月9日，安大略省圭尔夫市一家生产泳池化学品的工厂发生火灾。安大略省环境部（OMOE）调用了一台移动式痕量大气气体分析仪（TAGA）装置进行现场空气监测。TAGA装置的职责是实时监测泳池化学品燃烧释放的空气中污染物。这是通过使用配备最新款TAGA（IIe型）的大气压化学电离（APCI）源来实现的：这是一台三重四极杆质谱仪，可在十亿分率（ppb）的低水平下对空气中多种有毒物质进行直接采样和实时分析。在负APCI条件下的电离机制主要由电荷转移反应主导，产生母离子，母离子在Q1中被选择，在Q2中解离，产生的子离子在Q3中被识别。通过监测特定的母/子（P/D）离子对，TAGA IIe能够同时实时测量空气中存在的氯化氢（HCl）和氯气（Cl2）水平。TAGA IIe的响应通过多点校准曲线进行表征，对于HCl，校准曲线在高达250微克/立方米时呈线性，对于Cl2，校准曲线在高达600微克/立方米时呈线性。此应用中HCl和Cl2的平均检测限（DL）均为0.50微克/立方米。在3天的时间里，在火灾现场上风和下风的几个位置对HCl和Cl2进行了现场测量。当地官员利用TAGA装置收集的数据对空气中HCl和Cl2的水平进行实时评估。
