HR: 0800h
AN: A11A-0013    [Abstracts]
TI: A Simple But Comprehensive Methodology To Determine Gas-Phase Emissions Of Motor Vehicles With Extractive FTIR Spectrometry
AU: * Reyes, F M
EM: freyes@imp.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AU: Jaczilevich, A
EM: Jazcilev@servidor.unam.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AU: Grutter, M A
EM: Grutter@servidor.unam.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AU: Huerta, M A
EM: Grutter@servidor.unam.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AU: Rinc¢n, P
EM: Grutter@servidor.unam.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AU: Rinc¢n, R
EM: Grutter@servidor.unam.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AU: Gonz lez, R
EM: Grutter@servidor.unam.mx
AF: National Autonomous University of Mexico, Circuito Exterior S/n Ciudad Universitaria, Delegaci¢n Coyoacan 04510, M‚xico D.F., Mexico D.F., Mex 04510 Mexico
AB: In this contribution, a methodology to acquire valuable information on the chemical composition and evolution of vehicular emissions is presented. With this innovative experimental set-up, it is possible to obtain real-time emissions of the combustion products without the need of dilution or sample collection. Key pollutants such as CO, CO2, H2CO, CH4, NO, N2O, NH3, SO2, CH3OH, acetylene, ethylene, ethane and total hydrocarbons, most of which are not regulated nor measured by current emissions control programs, can be accurately monitored with a single instrument. An FTIR spectrometer is used for the analysis of a constant flow of sample gas from the tail-pipe into a stainless-steel cylindrical cell of constant volume.(1) The cell is heated to 185 øC to avoid condensation, the pressure is kept constant and a multi-pass optical arrangement(2)is used to transmit the modulated infrared beam several times to improve the sensitivity. The total flow from the exhaust used for calculating the emission can be continuously determined from the differential pressure measurements from a "Pitot" tube calibrated against a hot-wire devise. This simple methodology is proposed for performing state-of-the-art evaluations on the emission behavior of new technologies, reformulated fuels and emission control devices. The results presented here were performed on a dynamometer running FTP-75 and driving cycles typical for Mexico City.(3,4) References 1. Grutter M. "Multi-Gas Analysis using FTIR Spectroscopy over Mexico City." Atmosfera 16, 1-16 (2003). 2. White J.U. "Long optical paths of large aperture. J. Opt. Soc. Am., 32, 285-288 (1942). 3. Santiago Cruz L. and P.I. Rinc¢n. "Instrumentation of the Emission Control Laboratory at the Engineering School of the National Autonomous University of Mexico." Instrumentation and Development 4, 19-24, (2000). 4. Gonz lez Oropeza R. and A. Galv n Zacar¡as. "Desarrollo de ciclos de manejo caracter¡sticos de la Ciudad de M‚xico." Memorias del IX Congreso Anual, Soc. Mex. de Ing. Mec. 535-544 (2003).
DE: 0325 Evolution of the atmosphere
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
DE: 0345 Pollution--urban and regional (0305)
DE: 0394 Instruments and techniques
DE: 0933 Remote sensing
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting