Measuring atmospheric naphthalene with laser-induced fluorescence M. Martinez1,2, H. Harder1,2, X. Ren1, R. L. Lesher1, and W. H. Brune1 1Department of Meteorology, Pennsylvania State University, University Park, Pennsylvania, USA 2now at: Max-Planck-Institut für Chemie, Mainz, Germany
Abstract. A new method for measuring gas-phase naphthalene in the atmosphere is based
on laser-induced fluorescence at low pressure. The fluorescence spectrum of
naphthalene near 308 nm was identified. Naphthalene fluorescence quenching
by N, O and HO was investigated in the laboratory. No
significant quenching was found for HO with mixing ratio up to
2.5%. The quenching rate of naphthalene fluorescence is (1.980.18)
10cmmolecules for N, and
O at 297 K. Instrument calibrations were performed with a range of
naphthalene mixing ratios between 5 and 80 parts per billion by volume
(ppbv, 10. In the current instrument configuration, the detection
limit is estimated to be about 20 parts per trillion by volume (pptv,
10 with 2 confidence and a 1-min integration time.
Measurements of atmospheric naphthalene in three cities, Nashville, TN,
Houston, TX, and New York City, NY, are presented. Good correlation between
naphthalene and major anthropogenic pollutants is found.
Citation: Martinez, M., Harder, H., Ren, X., Lesher, R. L., and Brune, W. H.: Measuring atmospheric naphthalene with laser-induced fluorescence, Atmos. Chem. Phys., 4, 563-569, doi:10.5194/acp-4-563-2004, 2004.