1987
DOI: 10.1016/0146-6380(87)90030-1
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Rare earth elements and yttrium in lithotypes of Bulgarian coals

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Cited by 110 publications
(39 citation statements)
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“…In particular, rare earth elements (REEs) in coal have been identified as a group of special significance (Birk and White, 1991;Eskenazy, 1987;Mukhopadhyay et al, 1998;Querol et al, 1997). This is because REEs have two remarkable characteristics: (i) they exhibit a similar chemical behavior that imparts coherency to geochemical events, and (ii) they exhibit a systematic increase in the number of f electrons with increasing atomic number within the lanthanide series, which causes subtle chemical differences in passing from La to Lu.…”
mentioning
confidence: 99%
“…In particular, rare earth elements (REEs) in coal have been identified as a group of special significance (Birk and White, 1991;Eskenazy, 1987;Mukhopadhyay et al, 1998;Querol et al, 1997). This is because REEs have two remarkable characteristics: (i) they exhibit a similar chemical behavior that imparts coherency to geochemical events, and (ii) they exhibit a systematic increase in the number of f electrons with increasing atomic number within the lanthanide series, which causes subtle chemical differences in passing from La to Lu.…”
mentioning
confidence: 99%
“…The higher value of the correlation coefficient for the HREE and (OM) than the LREE and (OM) (r = 0.48 and r = 0.11, respectively), however, indicates a slightly higher relation of organic substance with HREE than LREE. Such dependence is frequently observed for coals all over the world (Plamer, 1990;Querol et al,1995;Eskenazy, 1987aEskenazy, , 1987bEskenazy, 1999). The REE contents determined for the tested ashes have been normalized to chondrites.…”
Section: Rare Earth Elementsmentioning
confidence: 99%
“…HREY have stronger ability to form soluble complexes and can be more easily to dissolve and migrate in seawater in comparison with LREY, due to shorter ionic radius of HREY (Eskenazy, 1987a;1987b). Fine clay minerals and organic matter give priority to adsorb and precipitate HREY, which leads to relative enrichment of HREY (Seredin and Shpirt, 1999;Liang et al, 2013).…”
Section: Energy Exploration and Exploitationmentioning
confidence: 99%
“…From a genetic point of view, REY abundance can be used to identify various coal-forming environments and their geochemical distribution patterns have been used to provide significant information about the nature of sediment source rocks (Eskenazy, 1987a;1987b;Finkelman, 1995;Ketris and Yudovich, 2009;Dai et al, 2008a;Zhao et al, 2012).…”
Section: Introductionmentioning
confidence: 99%