Stanovení skupin OH v huminových kyselinách s využitím methylace dimethylsíranem
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F44555601%3A13520%2F08%3A00004394" target="_blank" >RIV/44555601:13520/08:00004394 - isvavai.cz</a>
Výsledek na webu
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DOI - Digital Object Identifier
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Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Determination of OH groups in humic acids using methylation with dimethylsulfate
Popis výsledku v původním jazyce
The methylation of humic acids (HA) with dimethylsulfate in acetone and methanol followed by the iodometric determination of the methoxy groups (Zeisel reaction) were applied to determine the contents of OH groups in solid samples of HA of different origins. For the coal- and peat-derived HA samples, the contents of OH groups determined after methylation in acetone ranged from 6.6 to 8.7 mmol/g, whereas the contents of OH groups determined after methylation in methanol ranged from 4.0 to 5.0 mmol/g. These differences may be related to the content of carboxylic groups in the HA molecule that were not methylated in methanol, as confirmed by a comparison with results of conventional titrimetric determinations. Observed differences were interpreted as results of different polarity of both solvents and alkalinity of the reaction mixture during the methylation. The contents of alcoholic groups as well as some other minor OH groups can be estimated using the OH group contents obtained after m
Název v anglickém jazyce
Determination of OH groups in humic acids using methylation with dimethylsulfate
Popis výsledku anglicky
The methylation of humic acids (HA) with dimethylsulfate in acetone and methanol followed by the iodometric determination of the methoxy groups (Zeisel reaction) were applied to determine the contents of OH groups in solid samples of HA of different origins. For the coal- and peat-derived HA samples, the contents of OH groups determined after methylation in acetone ranged from 6.6 to 8.7 mmol/g, whereas the contents of OH groups determined after methylation in methanol ranged from 4.0 to 5.0 mmol/g. These differences may be related to the content of carboxylic groups in the HA molecule that were not methylated in methanol, as confirmed by a comparison with results of conventional titrimetric determinations. Observed differences were interpreted as results of different polarity of both solvents and alkalinity of the reaction mixture during the methylation. The contents of alcoholic groups as well as some other minor OH groups can be estimated using the OH group contents obtained after m
Klasifikace
Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
CB - Analytická chemie, separace
OECD FORD obor
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Návaznosti výsledku
Projekt
<a href="/cs/project/1M0554" target="_blank" >1M0554: Pokročilé sanační technologie a procesy</a><br>
Návaznosti
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Ostatní
Rok uplatnění
2008
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Talanta
ISSN
0039-9140
e-ISSN
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Svazek periodika
76
Číslo periodika v rámci svazku
4
Stát vydavatele periodika
GB - Spojené království Velké Británie a Severního Irska
Počet stran výsledku
4
Strana od-do
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Kód UT WoS článku
000258485700040
EID výsledku v databázi Scopus
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