SUPPORTING INFORMATION (Environ. Sci. Technol.)
Singlet Oxygen Generation in Alkaline Periodate Solution
Alok D. Bokare and Wonyong Choi*
School of Environmental Science and Engineering, Pohang University of Science and
Technology (POSTECH), Pohang 790-784, Korea
Figure S1. Effect of dissolved oxygen on the transformation kinetics of periodate (IO4−)
to iodate (IO3−): in the air-equilibrated solution (circle/black symbols) vs. in the
continuously N2-purged solution (triangle/red symbols). [KIO4] = 1 mM, [KOH] = 1 mM
and [FFA] = 100 µM.
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Figure S2. Effect of [Na2CO3] as superoxide scavenger on FFA oxidation kinetics in
KIO4/KOH system. [KIO4] = 1 mM, [KOH] = 1 mM, [FFA] = 100 µM.
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Figure S3. Formation of blue formazan product (right sample) after 5 h reaction of
nitroblue tetrazolium (NBT) with superoxide radicals generated in the KIO4/KOH
system. The left sample represents the NBT aqueous solution before the reaction. [KIO4]
= 1 mM, [KOH] = 1 mM, [NBT] = 1 mM.
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Figure S4. Effect of H2O2 concentration on FFA oxidation kinetics in the KIO4/KOH
system. [KIO4] = 1 mM, [KOH] = 1 mM, [FFA] = 100 µM.
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Figure S5. pH-dependent speciation of periodate ion. Adapted from: Lee, C.; Yoon, J. J.
Photochem. Photobiol. A 2004, 165, 35-41.
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Figure S6. Photograph of KIO4/KOH/FFA aqueous solutions taken 30 min after an
addition of equimolar concentration of different benzenediols. From left-to-right, the vial
contained catechol (CC), resorcinol (RSC) and hydroquinone (HQ), respectively. [KIO4]
= 1 mM, [KOH] = 1 mM, [FFA] = 100 µM, [benzenediol] = 1 mM.
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Figure S7. Effect of dissolved oxygen on kinetics of FFA oxidation in alkaline periodate
solution containing (a) Suwannee River Humic Acid and (b) Suwannee River Fulvic
Acid. [KIO4]0 = 1 mM, [KOH]0 = 1 mM, [FFA]0 = 100 µM, [NOM] = 50 mg/L.
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Figure S8. Kinetics of (a) FFA oxidation and (b) the accompanying periodate
transformation in presence of Aldrich Humic Acid (AHA). In panel (b), [IO4−] and [IO3−]
are represented by closed and open symbols, respectively. [KIO4]0 = 1 mM, [KOH]0 = 1
mM, [FFA]0 = 100 µM.
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