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Statements

Subject Item
n2:RIV%2F61989100%3A27360%2F04%3A00010171%21RIV%2F2005%2FGA0%2F273605%2FN
rdf:type
n8:Vysledek skos:Concept
dcterms:description
The formation of humic acids (HAs) from bituminous coal was verified by laboratory oxidation. In a relatively short time the oxidation by air at temperature above 150 °C led to the formation of HAs. These HAs were compared with those isolated from oxidized bituminous coal from the vicinity of red bed bodies, from weathered bituminous coal, oxihumolite and lignite. For this the organic and inorganic elemental composition of HAs, apparent dissociation constants, metal-binding capacities, nuclear magnetic resonance and infrared spectra were determined and evaluated. With increasing temperature of laboratory oxidation of bituminous coal the percentage of aromaticity of HAs increases. HAs prepared from coal oxidized at 150 °C are characterized by an aromaticity index 78% while for HAs prepared at 250 and 300 °C by 95% aromaticity. The same index for HAs isolated from naturally oxidized bituminous coals is of about 87% whereas it is of about 50% for oxihumolite and lignite. The apparent dissociation constan Huminové kyseliny z oxidovaných uhlí, I. Prvkové složení titrační křivky, těžké kovy v HA vzorcích, NMR spektra huminových kyselin a infračervené spektrometrie The formation of humic acids (HAs) from bituminous coal was verified by laboratory oxidation. In a relatively short time the oxidation by air at temperature above 150 °C led to the formation of HAs. These HAs were compared with those isolated from oxidized bituminous coal from the vicinity of red bed bodies, from weathered bituminous coal, oxihumolite and lignite. For this the organic and inorganic elemental composition of HAs, apparent dissociation constants, metal-binding capacities, nuclear magnetic resonance and infrared spectra were determined and evaluated. With increasing temperature of laboratory oxidation of bituminous coal the percentage of aromaticity of HAs increases. HAs prepared from coal oxidized at 150 °C are characterized by an aromaticity index 78% while for HAs prepared at 250 and 300 °C by 95% aromaticity. The same index for HAs isolated from naturally oxidized bituminous coals is of about 87% whereas it is of about 50% for oxihumolite and lignite. The apparent dissociation constan
dcterms:title
Humic acids from oxidized coals I. Elemental composition, titration curves, heavy metals in HA samples, nuclear magnetic resonance spectra of HAs and infrared spectroscopy Huminové kyseliny z oxidovaných uhlí, I. Prvkové složení titrační křivky, těžké kovy v HA vzorcích, NMR spektra huminových kyselin a infračervené spektrometrie Humic acids from oxidized coals I. Elemental composition, titration curves, heavy metals in HA samples, nuclear magnetic resonance spectra of HAs and infrared spectroscopy
skos:prefLabel
Huminové kyseliny z oxidovaných uhlí, I. Prvkové složení titrační křivky, těžké kovy v HA vzorcích, NMR spektra huminových kyselin a infračervené spektrometrie Humic acids from oxidized coals I. Elemental composition, titration curves, heavy metals in HA samples, nuclear magnetic resonance spectra of HAs and infrared spectroscopy Humic acids from oxidized coals I. Elemental composition, titration curves, heavy metals in HA samples, nuclear magnetic resonance spectra of HAs and infrared spectroscopy
skos:notation
RIV/61989100:27360/04:00010171!RIV/2005/GA0/273605/N
n3:strany
1237-1245
n3:aktivita
n18:P
n3:aktivity
P(GA105/02/0163)
n3:cisloPeriodika
54
n3:dodaniDat
n7:2005
n3:domaciTvurceVysledku
n4:6362125 n4:3870979 n4:2173220
n3:druhVysledku
n5:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n15:predkladatel
n3:idSjednocenehoVysledku
566862
n3:idVysledku
RIV/61989100:27360/04:00010171
n3:jazykVysledku
n6:eng
n3:klicovaSlova
Humic acids;Oxidized coal;Laboratory coal oxidation;Dissociation constants;Metal-binding capacity
n3:klicoveSlovo
n10:Laboratory%20coal%20oxidation n10:Dissociation%20constants n10:Humic%20acids n10:Metal-binding%20capacity n10:Oxidized%20coal
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[12BB3E419774]
n3:nazevZdroje
Chemosphere
n3:obor
n17:DB
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:projekt
n11:GA105%2F02%2F0163
n3:rokUplatneniVysledku
n7:2004
n3:svazekPeriodika
Neuveden
n3:tvurceVysledku
Havel, J. Kurková, Monika Klika, Zdeněk Kliková, Christiana
s:issn
0045-6535
s:numberOfPages
9
n16:organizacniJednotka
27360