2006 Volume 92 Issue 4 Pages 262-267
For monitoring of hazardous organic compounds, we have been developing an on-line analytical instrument based on a supersonic jet resonance enhanced multi-photon laser ionization (Jet-REMPI) mass spectrometry. We have attempted to apply this technique to monitor transient attitudes of hazardous organic compounds, e.g. in the exhaust gas.
It becomes possible that the real time monitoring of the gaseous compounds in atmosphere by our instrument with a continuous sample introduction. We demonstrated that the signals of mono-chlorinated benzene in the air could be detected with 150 s interval through a 23m stainless steel pipe, which kept 200 degree of centigrade. Our instrument has a very high vacuum pumping system to keep the difference of the vacuum level between in atmosphere and in ionization chamber. It has been proved that monitored molecules were well cooled as the result of REMPI spectra. It is strongly advantageous for the selective detection of a specific molecular species.
The emission mechanism of chlorinated aromatic compounds is discussed by monitoring 2 different kinds of compounds, simultaneously.
