Atmospheric Hydroxyl Radical Reaction Rate Coefficient and Total Environmental Lifetime of α-Endosulfan.

ABSTRACT: Endosulfan is a persistent organochlorine pesticide that was globally distributed before it was banned and continues to cycle in the Earth system. The chemical kinetics of the gas-phase reaction of α-endosulfan with the hydroxyl radical (OH) was studied by means of pulsed vacuum UV flash photolysis and time-resolved resonance fluorescence (FP-RF) as a function of temperature in the range of 348-395 K and led to a second-order rate coefficient k_OH = 5.8 × 10^-11 exp(-1960K/T) cm³ s^-1 with an uncertainty range of 7 × 10^-12 exp(-1210K/T) to 4 × 10^-10 exp(-2710K/T) cm³ s^-1. This corresponds to an estimated photochemical atmospheric half-life in the rang

SUBMITTER: Alarcon PC 

PROVIDER: S-EPMC10603777 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature