Atmospheric degradation of chloroacetoacetates by Cl atoms: Reactivity, products and mechanism in coastal and industrialized areas

STRACCIA C, V.G.; LUGO, P.L.; RIVELA, C.B.; BLANCO, M.B.; TERUEL, M.

ATMOSPHERIC ENVIRONMENT

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2023 vol. 309

1352-2310

inetic studies of the reaction of Cl atoms with ethyl 2-chloroacetoacetate, CH3C(O)CHClC(O)OCH2CH3, (k1) and methyl 2-chloroacetoacetate, CH3C(O)CHClC(O)OCH3, (k2) have been developed for the first time using SPME/GC-FID and in situ FTIR spectroscopy at (298±2) K and 1000 mbar in glass atmospheric chambers. Relative rate coefficients obtained by Fourier Transform Infrared Spectroscopy (FTIR) using different reference compounds, were the following (in cm3.molecule-1.s-1): kE2CAA-FTIR= (2.41 ± 0.57)×10-10 and kM2CAA-FTIR= (2.16 ± 0.85)×10-10. Similar and reproducible values were obtained using Gas Chromatography equipped with Flame Ionization Detection coupled with Solid Phase Micro Extraction (SPME), kE2CAA-GC-FID = (2.54 ± 0.81)×10-10 and kM2CAA-GC-FID = (2.34 ± 0.87)×10-10 all values in units of cm3.molecule-1.s-1. In addition, product studies were performed in similar conditions to the kinetic experiments to identify the reaction products and postulate their tropospheric degradati