HOMOGENEOUS GAS-PHASE CHEMILUMINESCENCE MEASUREMENT OF REACTIVE HYDROCARBON AIR-POLLUTANTS BY REACTION WITH OXYGEN-ATOMS

The present work was undertaken to develop a real-time continuous readout monitoring method for total hydrocarbon reactivity in the 0. 1 - 1000-ppm concentration range of interest in mobile engine exhaust CVS bag sample monitoring. Initial studies were made in a survey apparatus suitable for detailed spectrometric and kinetic observations but not suited to measurements at realistic hydrocarbon concentrations. These studies, discussed first, suggested a practical method, the DELTA I//3//0//8//. //9 method, for hydrocarbon monitoring. This method was then tested with realistic hydrocarbon concentrations in a test apparatus, the design of which was based on information obtained in the survey studies. The DELTA I//3//0//8//. //9 method developed is designed to adhere reasonably close to the Dimitriades scale but can also be adapted to different scales.