A laser induced fluorescence-based instrument for in-situ measurements of atmospheric formaldehyde.
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.
Hottle
John R
JR
University of Wisconsin-Madison, Department of Chemistry, 1101 University Ave, Madison, Wisconsin 53706, USA.
Huisman
Andrew J
AJ
DiGangi
Joshua P
JP
Kammrath
Aster
A
Galloway
Melissa M
MM
Coens
Katherine L
KL
Keutsch
Frank N
FN
D000393:Air Pollutants / Q000032:analysis*; D001272:Atmosphere; D005557:Formaldehyde / Q000032:analysis*; D007834:Lasers; D012680:Sensitivity and Specificity; D035501:Uncertainty
D000393:Air Pollutants; D005557:Formaldehyde