Kinetics for the reaction between the solvated electron and dissolved oxygen in n-dodecane from 2.5 to 40 °C

Temperature-controlled, time-resolved picosecond electron pulse radiolysis was utilized to measure the rate of reaction between the solvated electron (e S – ) and dissolved oxygen in n -dodecane solutions from 2.5 to 40 °C for the first time. At 20.0 °C, the reaction rate was determined to be k (e S – + O 2 ) = (4.54 ± 0.21) × 10 10 M −1 s −1 , with an activation energy of E a = 14.4 ± 1.3 kJ mol −1 . These newly determined kinetic parameters are important for predicting and managing the effects of aerated environments on the degradation of organic solvents used in nuclear fuel reprocessing technologies. • First kinetic measurements for e S – reaction with O 2 in n -dodecane (2.5–40 °C). • Determined second-order reaction rate coefficient at 20 °C: k = 4.54 × 10 1 ⁰ M⁻ 1 s⁻ 1 . • Activation energy: E a = 14.4 kJ mol⁻ 1 , pre-exponential factor: A = 1.76 × 10 1 ³ M⁻ 1 s⁻ 1 . • Superoxide (O 2 . •– ) formation in aerated systems may result in further degradation. • Insights into radiolytic stability of n -dodecane solvent in nuclear fuel reprocessing .