2002
DOI: 10.1016/s0022-2860(01)00971-1
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Spectroscopic study of humic acids fractionated by means of tangential ultrafiltration

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Cited by 78 publications
(65 citation statements)
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“…Low MS fraction is enriched in carboxylic groups compared to the other fractions and especially to high MS fraction. Such an increase of carboxylic acid content with a decrease of MS was already reported in previous studies using various fractionation procedures, SEC (Swift et al, 1992;Li et al, 2003) or ultra filtration (Wang et al, 1990;Christl et al, 2000;Francioso et al, 2002), but not in a so clear-cut way. High MS fraction was found to concentrate a great part of aliphatic C-H, amides and ethers, these functionalities being poorly present in low MS fraction.…”
Section: Discussionsupporting
confidence: 62%
“…Low MS fraction is enriched in carboxylic groups compared to the other fractions and especially to high MS fraction. Such an increase of carboxylic acid content with a decrease of MS was already reported in previous studies using various fractionation procedures, SEC (Swift et al, 1992;Li et al, 2003) or ultra filtration (Wang et al, 1990;Christl et al, 2000;Francioso et al, 2002), but not in a so clear-cut way. High MS fraction was found to concentrate a great part of aliphatic C-H, amides and ethers, these functionalities being poorly present in low MS fraction.…”
Section: Discussionsupporting
confidence: 62%
“…Such behavior stands in sharp contrast to myriad reports for ultrafiltration of fulvic and humic acids, which are routinely separated into ultrafiltration fractions by nominal cutoffs even as high as 100 000 Da (Aiken, 1984;Marley et al, 1992;Ikeda et al, 2000;Subbalakshmi et al, 2000;Clark et al, 2002;Francioso et al, 2002;Alberts and Takacs, 2004;Assemi et al, 2004;Peuravuori et al, 2005;Schwede-Thomas et al, 2005). Such fractionation, though not considered to represent the true molecular weight of the fractions due to complex ion repulsion and filter clogging phenomenon, nevertheless are frequently found to segregate humic and fulvic acids according to chemical structure.…”
Section: Ultrafiltrationcontrasting
confidence: 61%
“…On a mass basis, HA is less charged than FA, but HA shows more poliaromatic structure (Lumsdon and Fraser, 2005;Senesi and Loffedro, 2001). Some studies applied the FTIR spectroscopy to characterize functional groups (D'Orazio and Senesi, 2009;Francioso, et al, 2002) and biological properties of different HA molecular weight fractions. The distribution of functional groups is also ascribable to the plant species and age, and the partial incorporation into rhizosphere HA of typical root exudates (D'Orazio and Senesi, 2009).…”
Section: Humic Substances Characterizationmentioning
confidence: 99%