Field intercomparison of a novel optical sensor for formaldehyde quantification

Details Field intercomparison of a novel optical sensor for formaldehyde quantification Field intercomparison of a novel optical sensor for formaldehyde quantification

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2093f&link_type=abstract

Geophysical Research Letters, Volume 27, Issue 14, p. 2093-2096

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Atmospheric Composition And Structure: Pollution-Urban And Regional, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Atmospheric Composition And Structure: Instruments And Techniques

Scientific paper

A one-week in situ intercomparison campaign was completed on the Rice University campus for measuring HCHO using three different techniques, including a novel optical sensor based on difference frequency generation (DFG) operating at room temperature. Two chemical derivatization methods, 2,4-dinitrophenylhydrazine (DNPH) and o-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine (PFBHA), were deployed during the daylight hours for three- to four-hour time-integrated samples. A real-time optical sensor based on laser absorption spectroscopy was operated simultaneously, including nighttime hours. This tunable spectroscopic source based on difference frequency mixing of two fiber-amplified diode lasers in periodically poled LiNbO3 (PPLN) was operated at 3.5315 μm (2831.64 cm-1) to access a strong HCHO ro-vibrational transition free of interferences from other species. The results showed a bias of -1.7 and -1.2 ppbv and a gross error of 2.6 and 1.5 ppbv for DNPH and PFBHA measurements, respectively, compared with DFG measurements. These results validate the DFG sensor for time-resolved measurements of HCHO in urban areas.

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