Premium
Iron(III) reduction by natural humic acids: a potentiometric and spectroscopic study
Author(s) -
DEIANA S.,
GESSA C.,
MANUNZA B.,
RAUSA R.,
SOLINAS V.
Publication year - 1995
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/j.1365-2389.1995.tb01816.x
Subject(s) - potentiometric titration , chemistry , reduction (mathematics) , environmental chemistry , natural (archaeology) , humic acid , organic chemistry , geology , ion , mathematics , fertilizer , paleontology , geometry
Summary 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.