Oxygen Quench Effect on Flame Ionization Detector for Hydrocarbon Emission Measurements
While developing one of the first commercialized Super Ultra Low Emission Vehicles, one vehicle manufacturer also improved the method for measuring low level hydrocarbons . This was accomplished by enhancing the Constant Volume Sample System, and correcting hydrocarbon measurements from the Flame Ionization Detector hydrocarbon analyzer for the effect of oxygen quench. Based on the manufacturer's results, it appears that the variation in oxygen content of the calibration gas, span gas, zero gas, and sample gas can affect the accuracy of low level hydrocarbon measurement. Within the last couple of years, the United States Environmental Protection Agency and the California Air Resources Board approved the Bag Mini Diluter method for emission sampling [2,3]. This method was developed by the American auto industry in cooperation with government agencies within the American Industry/Government Emissions Research Consortium.