Study on the reaction of carbon disulfide with hydroxyl radical in aqueous solution

The laser flash photolysis technique is employed to investigate the reaction mechanism of CS₂ with ·OH in the nitrogen-saturated aqueous solution. By comparison of the transient absorption spectra obtained at different phases and pHs and through the addition of proper radical cation scavenger, CS₂ is determined to react with · OH to form · CS₂OH adduct, instead of the CS₂+ radical cation. At pH 1–5, · CS₂OH decomposes into COS and · HS, while at pH > 5, it further reacts with OH- to form CS₂O-. The temperature dependent kinetics for the reaction CS₂ + · OH → · CS₂OH is also reported in this paper with an estimated activation energy of (26.9±1.0) kJ · mol⁻¹.