About: Dissociation ability of humic acids: Spectroscopic determination of pKa and comparison with multi-step mechanism.

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About: Dissociation ability of humic acids: Spectroscopic determination of pKa and comparison with multi-step mechanism. Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Humic acids are operationally defined as the fraction of humic substances which is not soluble under acidic conditions. This, does not mean, however, that their solid particles easily dissolve in water. Experimental results suggest that the dissolving of solid humic acids in an aqueous environment is more complex than the conventional solubility behaviour of sparingly soluble solids. The multi-step mechanism of their interaction with water includes partial equilibrium dissolution as well as direct equilibrium dissociation from the solid state. In this work, the pKa value of the dissolved humic acid fraction was determined on the basis of changes in the shape and intensity of their UV/VIS spectra measured in media with various values of pH. The shape of the spectra depends on the pH value, because acidic and alkaline media, in which these compounds are dissolved, shift their dissociation equilibrium towards non-dissociated molecules or to completely dissociated species. The aim of this work was to char Humic acids are operationally defined as the fraction of humic substances which is not soluble under acidic conditions. This, does not mean, however, that their solid particles easily dissolve in water. Experimental results suggest that the dissolving of solid humic acids in an aqueous environment is more complex than the conventional solubility behaviour of sparingly soluble solids. The multi-step mechanism of their interaction with water includes partial equilibrium dissolution as well as direct equilibrium dissociation from the solid state. In this work, the pKa value of the dissolved humic acid fraction was determined on the basis of changes in the shape and intensity of their UV/VIS spectra measured in media with various values of pH. The shape of the spectra depends on the pH value, because acidic and alkaline media, in which these compounds are dissolved, shift their dissociation equilibrium towards non-dissociated molecules or to completely dissociated species. The aim of this work was to char (en)
Title	Dissociation ability of humic acids: Spectroscopic determination of pKa and comparison with multi-step mechanism. Dissociation ability of humic acids: Spectroscopic determination of pKa and comparison with multi-step mechanism. (en)
skos:prefLabel	Dissociation ability of humic acids: Spectroscopic determination of pKa and comparison with multi-step mechanism. Dissociation ability of humic acids: Spectroscopic determination of pKa and comparison with multi-step mechanism. (en)
skos:notation	RIV/00216305:26310/14:PU108195!RIV15-MSM-26310___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(GA104/08/0990), P(LO1211)
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Klučáková, Martina Kolajová, Romana
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Vysoké učení technické v Brně / Fakulta chemická
http://linked.open...dnocenehoVysledku	11785
http://linked.open...ai/riv/idVysledku	RIV/00216305:26310/14:PU108195
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Reactivity, Diffusion, Humic Acids, Hydrogels (en)
http://linked.open.../riv/klicoveSlovo	Humic Acids Reactivity Diffusion Hydrogels
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[79225863331C]
http://linked.open...i/riv/nazevZdroje	REACTIVE & FUNCTIONAL POLYMERS
http://linked.open...in/vavai/riv/obor	CF
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Ultrasound spectroscopy in study of complexation of humic substances Materials Research Centre at FCH BUT- Sustainability and Development
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	78
http://linked.open...iv/tvurceVysledku	Klučáková, Martina Kratochvílová, Romana
issn	1381-5148
number of pages	6 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.reactfunctpolym.2014.02.005
http://localhost/t...ganizacniJednotka	26310

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