title: A laser induced fluorescence-based instrument for in-situ measurements of atmospheric formaldehyde.
abstract: Direct, in situ detection of gas phase formaldehyde (HCHO) via laser induced fluorescence in a White-type multipass cell is demonstrated with a (3sigma) limit of detection of approximately 0.051 parts per billion by volume in a 1 s sampling time. Calibration is performed in two ways: using permeation tubes and with air bubbled through an aqueous solution of HCHO. The concentration of HCHO output from the bubbler is measured by cavity ring-down spectroscopy. Measurement of ambient HCHO is carried out at the University of Wisconsin, Madison for a period of several days.
authors.affiliation: University of Wisconsin-Madison, Department of Chemistry, 1101 University Ave, Madison, Wisconsin 53706, USA.
authors.forename: John R
authors.initials: JR
authors.lastname: Hottle
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Huisman
authors.forename: Joshua P
authors.initials: JP
authors.lastname: DiGangi
authors.forename: Aster
authors.initials: A
authors.lastname: Kammrath
authors.forename: Melissa M
authors.initials: MM
authors.lastname: Galloway
authors.forename: Katherine L
authors.initials: KL
authors.lastname: Coens
authors.forename: Frank N
authors.initials: FN
authors.lastname: Keutsch
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere; D005557:Formaldehyde / Q000032:analysis*; D007834:Lasers; D012680:Sensitivity and Specificity; D035501:Uncertainty
chemical_list: D000393:Air Pollutants; D005557:Formaldehyde