T- and pH-Dependent Hydroxyl-Radical Reaction Kinetics of Lactic Acid, Glyceric Acid, and Methylmalonic Acid in the Aqueous Phase.

ABSTRACT: Carboxylic acids are a common class of compounds found in atmospheric aerosols and cloud droplets. In this study, the oxidation kinetics of several carboxylic acids in the aqueous phase by the atmospherically relevant ^•OH radical were investigated to better understand the loss processes for this class of compounds. The rate constants for the reactions of the ^•OH radical were determined using the thiocyanate competition kinetics method for lactic acid, glyceric acid, and methylmalonic acid as a function of temperature and pH. The Arrhenius equations for oxidation by the ^•OH radical are as follows (unit in L mol^-1 s^-1): For lactic acid: k(T, HA) = (1.3 ± 0.1) × 10¹⁰ × exp[(-910 ± 160 K)/T] and k(

SUBMITTER: Hu Y 

PROVIDER: S-EPMC11874031 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature