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Reductive dissolution of 7 A bimessite [Mi 2+  0.05 Mn 3+  0.25 Mn 4+  0.7 O 1.7 (OH) 0.25 ] by selenious acid (H 2 SeO 3 ) produces Mn 3+  and Mn 2+  surface reaction products (here represented as S-MnOOH and S-MnO. respectively) and Mn 2+ , 3+ -selenite surface complexes at the solution-mineral interface. Mn2p 3/2 , Se3d. and O1s X-ray photoelectron spectra of reacted surfaces reveal that Mn 4+  of birnessite is reduced simultaneously to Mn 3+  and Mn 2+  while Se 6+  is oxidized to Se 4+  according to the probable stoichiometric reactions:

XPS study of reductive dissolution of birnessite by H 2 SeO 3 with constraints on reaction mechanism