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Statements

Subject Item
n2:RIV%2F00216305%3A26310%2F03%3APU38208%21RIV%2F2004%2FMSM%2F263104%2FN
rdf:type
skos:Concept n10:Vysledek
dcterms:description
A bulk humic acid (HA) extracted from a South Moravian lignite was further fractionated by sequential extraction in buffers at different pHs. All samples were analyzed by high performance size exclusion chromatography (HPSEC) and elemental analysis. Weight-averaged molecular weights (Mw) of fractions dissolved at pH 7, 8, and 9 were larger than for the parent bulk HA, thereby indicating that Mw of humic matter is related only to molecular size as affected by sample hydration rather than its molecular maass. Moreover, hydration radius was a function of the specific chemical properties of humic fractions. Addition of small amount of either mineral (HCl) or organic acid (formic, acetic, propionic) to humic solutions induced significant changes in conformational arrangements of the treated sample in respect to control. Also the conformational changes among humic fractions depended on their different molecular composition and suggested a weakly-bound supramolecular association of different humic molecules A bulk humic acid (HA) extracted from a South Moravian lignite was further fractionated by sequential extraction in buffers at different pHs. All samples were analyzed by high performance size exclusion chromatography (HPSEC) and elemental analysis. Weight-averaged molecular weights (Mw) of fractions dissolved at pH 7, 8, and 9 were larger than for the parent bulk HA, thereby indicating that Mw of humic matter is related only to molecular size as affected by sample hydration rather than its molecular maass. Moreover, hydration radius was a function of the specific chemical properties of humic fractions. Addition of small amount of either mineral (HCl) or organic acid (formic, acetic, propionic) to humic solutions induced significant changes in conformational arrangements of the treated sample in respect to control. Also the conformational changes among humic fractions depended on their different molecular composition and suggested a weakly-bound supramolecular association of different humic molecules
dcterms:title
Conformational behavior of lignite humic fractions separated by sequential pH-extractions Conformational behavior of lignite humic fractions separated by sequential pH-extractions
skos:prefLabel
Conformational behavior of lignite humic fractions separated by sequential pH-extractions Conformational behavior of lignite humic fractions separated by sequential pH-extractions
skos:notation
RIV/00216305:26310/03:PU38208!RIV/2004/MSM/263104/N
n3:strany
683-689
n3:aktivita
n11:Z
n3:aktivity
Z(MSM 263100019)
n3:cisloPeriodika
7
n3:dodaniDat
n5:2004
n3:domaciTvurceVysledku
n9:6514405 n9:2784408
n3:druhVysledku
n14:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
602014
n3:idVysledku
RIV/00216305:26310/03:PU38208
n3:jazykVysledku
n15:eng
n3:klicovaSlova
humic substances, lignite, HPSEC
n3:klicoveSlovo
n6:humic%20substances n6:lignite n6:HPSEC
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[2D301F01C975]
n3:nazevZdroje
Fresenius Environmental Bulletin
n3:obor
n16:CF
n3:pocetDomacichTvurcuVysledku
2
n3:pocetTvurcuVysledku
4
n3:pocetUcastnikuAkce
0
n3:pocetZahranicnichUcastnikuAkce
0
n3:rokUplatneniVysledku
n5:2003
n3:svazekPeriodika
12
n3:tvurceVysledku
Pekař, Miloslav Kučerík, Jiří
n3:zamer
n12:MSM%20263100019
s:issn
1018-4619
s:numberOfPages
7
n18:organizacniJednotka
26310