Månaderna utan R

Fourier Transform Infrared Spectroscopy of Aerosol Collected in a Low Pressure Impactor (LPI/FTIR): Method Development and Field Calibration

“…The spectra did show a very weak absorbance near 1530 cm-' and this may be due to nitroaromatics present at levels of approximately a few nanograms per cubic meter. Such levels are consistent with predictions of nitroaromatic concentrations based on ambient loadings of polyaromatic hydrocarbons and yields of nitroaromatics from these compounds (Atkinson, 1990;Raval, 1993). Gordon et al (1988) have also detected small quantities of nitroaromatic compounds in Southern California fine aerosol as indicated by absorptions at 1524 cm-', after liquid chromatographic separation of aerosol filter samples.…”

Compostos carbonílicos atmosféricos: fontes, reatividade, níveis de concentração e efeitos toxicológicos

“…Outra importante rota de formação de compostos carbonílicos na atmosfera, que tem sido bastante estudada, é a reação de alcenos com ozônio [25][26][27][28][29][30][31][32][33][34][35] (reações 18 e 19). A primeira etapa dessa reação envolve a formação de um ozonídeo: Esta espécie é extremamente instável e energética, sofrendo dissociação espontânea para formar um composto carbonílico e um birradical:…”

Rate constants for the gas‐phase reactions of Ozone with unsaturated Aliphatic Alcohols

“…The reaction of ozone with olefins is of major importance in atmospheric chemistry [1,2]. Kinetic data for the ozone-olefin reaction are needed to develop a better understanding of oxidant formation and aerosol production in the atmosphere [3 -51.…”