Mechanism studies on reactions of •OH, •H and eaq- with 2-chlorophenol in aqueous solutions

Pulse radiolysis of aqueous 2-chlorophenol in dilute solutions under different conditions was studied. The main characteristic peaks in these transient absorption spectra were attributed and the build-up/decay trends of several transient species were investigated. Under alkaline conditions, the reaction of OH radical and 2-chlorophenol produces o-chlorinated phenoxyl radical with a rate constant of 1. 0 x 10(9) L . mol(-1) . s(-1) ; while under acid conditions, the initial product is mainly OH-adduct. The reaction be H and 2-chlorophenol produces H-adduct. In alkaline and nearly neutral solutions, e(aq)(-) can capture Cl directly from 2-chlorophenol with a rate constant 1. 25 x 10(9) L . mol(-1) . s(-1) and 6. 3 x 10(8) L . mol(-1) s(-1), respectively.