Schripp T, Etienne S, Fauck C, Fuhrmann F, Märk L, Salthammer T
Department Material Analysis and Indoor Chemistry, Fraunhofer WKI, Braunschweig, Germany.
Indoor Air. 2014 Apr;24(2):178-89. doi: 10.1111/ina.12061. Epub 2013 Aug 19.
In the field of Indoor Air Quality research, the measurement of volatile organic compounds (VOCs) demands instruments that are rapid, mobile, robust, highly sensitive and allow for simultaneous monitoring of multiple compounds. These instruments should also compensate for possible interferences from permanent gases and air humidity. Proton-transfer-reaction-mass-spectrometry (PTR-MS) has proved to be a valuable and promising technique that fits the mentioned requirements for a suitable online measuring device. In this study, five exemplary applications of PTR-MS are described: (i) release of paint additives during drying process, (ii) emission of VOCs from active hardcopy devices, (iii) reference material evaluation, (iv) diffusion studies, and (v) emission testing of building products. The examples are selected to illustrate possibilities and limitations of the PTR technique in this field of research. The quadruple-based PTR-QMS was able to determine the emission characteristics during the experiments, especially in case of depleting emission sources (e.g., reference material). This allows for chemometrical analysis of the measured release patterns and detection of underlying processes. However, PTR-QMS reaches a functional limit in case of compound identification. If identification of VOCs is necessary, the measurements need to be accompanied by GC/MS analytics or a PTR instrument with higher mass-resolution (e.g., PTR-TOF-MS).
在室内空气质量研究领域，挥发性有机化合物（VOCs）的测量需要快速、便携、坚固、高灵敏度且能同时监测多种化合物的仪器。这些仪器还应补偿永久性气体和空气湿度可能产生的干扰。质子转移反应质谱法（PTR-MS）已被证明是一种有价值且很有前景的技术，符合对合适在线测量设备的上述要求。在本研究中，描述了PTR-MS的五个典型应用：（i）干燥过程中涂料添加剂的释放，（ii）有源硬拷贝设备中VOCs的排放，（iii）参考物质评估，（iv）扩散研究，以及（v）建筑产品的排放测试。选择这些例子来说明PTR技术在该研究领域的可能性和局限性。基于四极杆的PTR-QMS能够在实验过程中确定排放特征，特别是在排放源耗尽的情况下（例如参考物质）。这使得能够对测量的释放模式进行化学计量分析并检测潜在过程。然而，在化合物识别方面，PTR-QMS达到了功能极限。如果需要识别VOCs，则测量需要辅以GC/MS分析或更高质量分辨率的PTR仪器（例如PTR-TOF-MS）。
