Acid-base properties of fractionated humic acids

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F08%3APU75816" target="_blank" >RIV/00216305:26310/08:PU75816 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Acid-base properties of fractionated humic acids
Original language description
Humic acids (HA) were fractionated by their dissolution in universal buffers (NaOH, H3BO3, H3PO4 and CH3COOH) with various pH-values. Obtained fractions were characterized by UV/VIS and FT-IR spectroscopy and their acid-base properties were studied. It was found that contain of acidic groups in majority of individual fractions is higher than the content of original HA samples. Our hypothesis is that HA structure is changed during fractionation. HA can interact with individual components of buffer and re-arranged their structure, which results in apparently higher acidity of obtained fractions. The re-arrangement of HA structure probably causes, that some acidic groups inside HA aggregates, which are not able dissociate in original HA sample, can contribute to measured acidity in individual fractions. Surprising result is that residue after dissolving original HA in very alkaline buffer (pH = 12) has after fractionation (and "exhaustion" of the largest amount of HA fraction) several tim
Czech name
Acido-bazické vlastnosti frakcionovaných huminových kyselin
Czech description
Huminové kysely byly rozděleny do frakcí rozpouštěním v pufrech o různých hodnotách pH, získané frakce byly charakterizovány zejména s ohlede na jejich acido-bazické vlastnosti.

Publication year
2008
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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