 The rate constant ("k1") for this reaction was determined to be 1.0 × 108 M−1 s−1, while the parallel reaction of OH with was found to be much slower.This rate was re-determined by using two pulse radiolysis competition methods with benzoate and thiocyanate ions at pH 11.4.A value of "k"1 = (9 + 1) × 107 M−1 s−1 was obtained from both systems.