High abundance of gaseous and particulate 4-oxopentanal in the forestal atmosphere.
Atmospheric concentrations of 4-oxopentanal (4-OPA) in both gas and particulate phase were measured at the experimental forest, 200 km north of Sapporo, Japan, from August 13 to 15, 2001. 4-OPA was collected using an annular denuder sampling system and measured with a gas chromatography employing benzylhydroxyl oxime derivatization. Its gas phase concentrations ranged from 180 ng m(-3) (44 pptv) to 1570 ng m(-3) (384 pptv), whereas those in the particulate phase were from below the detection limit (25 ng m(-3)) to 207 ng m(-3). The particulate 4-OPA accounted for 28% (particle/(gas+particle)) of the total concentration as the maximum at 06:00 on August 15th (average: 10%). The particulate concentrations of 4-OPA were found to be comparable to those of pinonic acid, indicating that 4-OPA is also an important constituent of organic aerosols in the forestal atmosphere. Here, we report, for the first time, the concentrations of 4-OPA in both gas and particulate phase and its diurnal variations in the forestal atmosphere.
Matsunaga
Sou
S
Institute of Low Temperature Science, Hokkaido University, N19 W8, Kita-Ku, Sapporo 060-0819, Japan. smatsu@ucar.edu
Mochida
Michihiro
M
Kawamura
Kimitaka
K
D000393:Air Pollutants / Q000032:analysis*; D000447:Aldehydes / Q000032:analysis*; D002849:Chromatography, Gas; D004784:Environmental Monitoring; D007564:Japan; D014197:Trees / Q000737:chemistry*
D000393:Air Pollutants; D000447:Aldehydes