Iron(III) reduction by natural humic acids: a potentiometric and spectroscopic study |
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| Authors: | S. DEIANA,C. GESSA,B. MANUNZA,R. RAUSA&Dagger ,V. SOLINAS |
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| Affiliation: | Dipartimento di Scienze Ambientali Agrarie e Biotecnologie Agroalimentari, Universitàdi Sassari, Viale Italia 39, 07100 Sassari, Italy;Istituto di Chimica Agraria, Universitàdi Bologna, Viale BertiPichat 10, 40127 Bologna, Italy;Eniricerche, Via Maritano 26, 20097 S.Donato Milanese, Italy |
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| Abstract: | The reduction of iron(III) by natural humic acid (NHA) was studied in aqueous solution as a function of pH, time and iron(III) concentration. The information gained from FTIR and ESR spectroscopies as well as potentiometric data suggests that redox reactions occur at a low pH due to the involvement of phenolic groups and radicals. At pH values higher than 3.5 the reaction is strongly inhibited by the formation of iron(III)–humate complexes. |
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