New Method for Determination of pKa of Humic Acid
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26310%2F11%3APU92853" target="_blank" >RIV/00216305:26310/11:PU92853 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
New Method for Determination of pKa of Humic Acid
Original language description
New method of the determination of pKa is presented. The UV/VIS spectra of organic compounds with acidic groups depend on the pH of solution, because acidic and alkaline mediums, in which these compound are dissolved, shift the dissociation equilibrium of organic compounds towards nondissociated (macro)molecules or completely dissociated particles. This spectroscopic method is based on the shift of shape and intensity of absorbance spectra at the changes of pH of solution. The aim of this work is to characterize and to determine dissociation constants of lignitic humic acids in water by this methods and comparison of obtained results with those of classical one. It was found out that after the modification it was possible to use the spectrophotometry method for the determination of pKa of these substances, while the use of method was verified within the three different samples of humic acids. The optimal ratio humic acids/water and the extent of wavelength for measuring UV/VIS spectra
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GA104%2F08%2F0990" target="_blank" >GA104/08/0990: Ultrasound spectroscopy in study of complexation of humic substances</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Proc. 15th Internationl Conference on Environment and Mineral Processing. Part I -III
ISBN
978-80-248-2387-4
ISSN
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e-ISSN
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Number of pages
5
Pages from-to
225-229
Publisher name
VŠB-TU Ostrava
Place of publication
Ostrava
Event location
Ostrava
Event date
Jun 8, 2011
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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