in not given room temp., pH=0.5-8;

thiourea dioxide; Co(II) phthalocyanine tetrasulfonic acid (4.4'.4''.4''') (4-) in water-d2 Kinetics; reaction between SO2(2-) and Na(15)NO3 in aq. NaOD and D2O at 25°C in the presence of Co-complex at pH 13.6, thiourea dioxide added, 26, 65 h; monitored by NMR;