Abstract
To investigate the behavior and origins of atmospheric aldehydes, sampling of ambient air with 2, 4-dinitrophenylhydrazine-impregnated C18 cartridge was performed at Saitama University, Urawa in the summer season, 1983 and ambient concentrations of aldehydes were determined by HPLC-UV method. Average concentrations of HCHO, CH3CHO, C3H7CHO (identified tentatively), and C6H5CHO in daytime were ca. 5, 3, 5, and 0.4ppb (v/v), respectively. Regression analyses between each aldehyde's concentration and O3-, CO-, or NMHC-concentration gave the suggestive data that the origins of C3H7CHO (identified tentatively) and C6H5CHO were mainly secondary formation via. photochemical reaction, and those of HCHO and CH3CHO consisted of both of direct emission by combustion of fossil fuels and secondary formation.
