Comparison of physical and chemical properties of maceral groups separated by density dradient centrifugation

Autor:	David M. Grant, Jirina Karas, Ronald J. Pugmire, Warner R. Woolfenden, Skeen Blair
Rok vydání:	1985
Předmět:	Elemental composition Chemistry Stratigraphy Maceral Analytical chemistry Mineralogy chemistry.chemical_element Geology Aromaticity Reflectivity Fuel Technology Group (periodic table) Economic Geology Centrifugation Particle density Carbon
Zdroj:	International Journal of Coal Geology. 5:315-338
ISSN:	0166-5162
DOI:	10.1016/0166-5162(85)90001-1
Popis:	Eight coals have been selected for study of the physical and chemical properties of the maceral group . The density-gradient centrifugation technique was employed to affect maceral group separation. The maximum reflectance method of Ting and Lo was used for estimating the reflectance of very small coal particles. The reflectograms were used to characterize the separated maceral fractions. The density, elemental composition, reflectance, NMR parameters of aromaticity, protonated aromatic carbon content and ƒstuggeredastuggeredH of the maceral groups were compared. Variations in the aromatic structure of the maceral groups are discussed as well as the observation that ƒstuggereda and ƒstuggeredastuggeredH change with particle density.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8dc1c302e2472bc0ca23ca61b515a94c https://doi.org/10.1016/0166-5162(85)90001-1 Zobrazit plný text záznamu