Hydrochloroethers in the troposphere: kinetics with Cl atoms, lifetimes and atmospheric acceptability indices

PABLO DALMASSO, RAUL TACCONE, JORGE NIETO, PABLO COMETTO, SILVIA LANE

PERGAMON-ELSEVIER SCIENCE LTD

Año: 2012 p. 104 - 104

ate constants for the gas-phase reactions of chlorine atoms with 2-chloroethyl ethyl ether (k1) and bis(2-chloroethyl) ether (k2) were determined for the first time using a conventional relative rate technique. Experiments were carried out at (298 2) K and atmospheric pressure using synthetic air as bath gas. The decay rates of the hydrochloroethers were measured relative to those of n-pentane and n-heptane. The following rate constants were derived in units of cm3 molecule 1 s 1 : k1 ¼ (1.7 0.5) 10 10 and k2 ¼ (1.0 0.3) 10 10 . The rate constants obtained are compared with previous literature data to indicate reactivity trends and are used to estimate the global atmospheric lifetimes (sglobal ) of the studied hydrochloroethers. Radiative forcing efficiencies (RE) of the ethers were determined from their integrated IR absorption cross-sections. Using sglobal and RE, estimations were made of atmospheric hazard indices of the two chlorinated ethers su