Temperature dependence of reactions between aqueous manganese ions and water radiolysis products

Abstract

This study explores the temperature-dependent kinetics of reactions between aqueous Mn²⁺ ions and primary water radiolysis products, with emphasis on the transient behavior of short-lived manganese species. Rate constants for Mn²⁺ reactions with the hydrogen atom (H), hydroxyl radical (˙OH), and superoxide (O₂˙⁻) were determined across a pH range of 1–6 and a temperature range of 1–60 °C. All reactions followed Arrhenius behavior, indicating consistent thermal activation across redox pathways. The findings enhance our understanding of manganese redox chemistry in radiation-influenced systems, with implications for catalysis, energy conversion, and reactor chemistry.