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EPR spectra of (a) PMS and (b) PDS alone, with Fe(II) and with Fe(II) + HCO3– (initial pH: 7.0; the PMS system: [PMS]0 = 0.04 mM, [Fe(II)]0 = 0 or 0.2 mM, [HCO3–]0 = 0 or 0.5 mM; the PDS system: [PDS]0 = 1.0 mM, [Fe(II)]0 = 0 or 2.0 mM, [HCO3–]0 = 0 or 5.0 mM).
