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Application of resonance-enhanced multiphoton ionization time-of-flight mass spectrometry (REMPI-TOFMS) for on-line trace analysis of combustion and pyrolysis products in technical processes

We present first applications of resonance-enhanced multiphoton ionization time-of-flight mass spectrometry (REMPI-TOFMS) for on-line monitoring of technical water incinerator flue gases and coffee roasting process off- gases. The results were obtained with a newly developed, mobile REMPI-TOFMS device. The combination of laser induced resonance-enhanced multiphoton ionization and time-of-flight mass spectrometry represents a highly selective as well as sensitive analytical technique, well suited for species selective real-time on-line monitoring of trace-products in of-gases from thermal processes or technical incinerators. The achievable sensitivities are in the ppb-range or better for aromatic compounds. The high selectivity is due to the combination of mass- and optical selectivity, the high sensitivity is caused by the high cross sections of resonance-enhanced two photon ionization with lasers. On- line monitoring of trace chemicals, formed during combustion- or pyrolysis-processes, is useful e.g. for feed back steering of combustion processes in order to minimize the formation of hazardous byproducts or for optimization of the economic efficiency of thermal production processes.