Figure 1: Representative first-order plot to evaluate the pseudo-first-order rate constant (kobs) for phenanthroline-promoted Cr(VI) oxidation of DMSO in aqueous solution at 30°C. (DMSO)T=75 × 10-4 mol dm-1 ,(Cr(VI))T=5 × 10-4 mol dm-1, (H2SO4)T=0.5 mol dm-1, (phen)T=50 × 10-4 mol dm-1.