The Method Study on Emergency Detection of Aromatic Compounds and Chlorides based on Portable GC-MS

In order to quickly identify the kinds of volatile organic compounds(VOCs) and quantified their concentrations, a method based on portable GC−MS was developed, which was especially suitable for the detection of aromatic compounds and chlorides. The mixed gases were directly collected by solid phase microextraction head for 120 seconds. After that, they were analyzed on the portable GC-MS, identified by retention time and MS peaks, quantified by external standard method. It only took 6.4 min from sampling to get the result. The linear correlation was larger than 0.98, and the minimum detectable concentration was lower than half of their occupational exposure limits, respectively. In the simulation test, the relative error was lower than 4.4%. This method can directly collect the air sample in the field, rarely depends on external conditions, and is very convenient to carry out. It takes very short time to complete the detection, at the same time it can identify and quantify multiple kinds of gases at a time. So this method is quite suitable for the emergency detection at the gas leak site.