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[ÇóÖú] Rates and Extent of Reduction of Fe(III) Compounds and O2 by Humic Substances

Although nonreduced HS transferred significant amounts of electrons only to dissolved Fe(III) citrate and ferrihydrite, reduced HS additionally
reduced goethite and hematite . ¶Á²»Ì«¶®¡£
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Reoxidation of reduced HS by O2 took place within minutes and yielded reoxidized HS that were still more reduced than nonreduced HS,
indicating that some reduced moieties in HS are protected from reoxidation by O2 .
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