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.
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.
IRON(III) REDUCTION BY NATURAL HUMIC ACIDS - A POTENTIOMETRIC AND SPECTROSCOPIC STUDY / Deiana, Salvatore Andrea; Gessa, C; Manunza, B; Rausa, R; Solinas, V.. - In: EUROPEAN JOURNAL OF SOIL SCIENCE. - ISSN 1351-0754. - 46:1(1995), pp. 103-108.
IRON(III) REDUCTION BY NATURAL HUMIC ACIDS - A POTENTIOMETRIC AND SPECTROSCOPIC STUDY
DEIANA, Salvatore Andrea;MANUNZA B;
1995-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
