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Kolekcje
Inne
H-binding groups in lignite νs.soil humic acids: NICA-Donnan and spectroscopic parameters.
Autorzy
Rok wydania
2009
Czasopismo
Journal of Colloid and Interface Science
Numer woluminu
332
Strony
78-84
DOI
10.1016/j.jcis.2008.12.023
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
A comparative study has been carried out for two sets of humic acids isolated from lignites and soils. H-binding data were analyzed using the NICA-Donnan model, for three Greek lignite humic acids (HA) plus IHSS Leonardite reference HA, and five Greek soil HAs plus a commercial peat HA. (13)C-CP-MAS NMR and H-binding data provide quantitative estimates for functional groups, showing that lignite HAs of diverse origin have strikingly homogeneous properties, while the H-binding structural units of soil HAs are characterized by a large degree of variability. Consistent differences between soil HA vs. lignite HA are revealed at the level of functional groups' concentrations. In the pH range 4 to 10, soil HA showed a charge variation <3 [equiv kg(-1)] while lignite HAs showed a higher charge variation >3.5 [equiv kg(-1)].
Słowa kluczowe
humic acid, lignite, soil, Greek, NICA, H-binding, 13 C NMR, spectroscopy
Adres publiczny
https://doi.org/ 10.1016/j.jcis.2008.12.023
Strona internetowa wydawcy
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