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- W2276934343 abstract "A method for the direct determination of oxygen in coal involves neutral activation analysis, i.e., neutron bombardment to convert oxygen-16 to nitrogen-16 followed by spectroscopic analysis of the 6.1 and 7.1 Mev ..gamma..-radiation emitted. Application of the method to 33 coals ranging from lignite to bituminous, both as-received and moisture-free, showed considerable variation between the oxygen contents so determined and those determined by difference after analysis of carbon, hydrogen, nitrogen, and sulfur; 17 of the coals showed higher oxygen contents after than before drying at 105/sup 0/C, indicating that some oxidation occurs during oven drying. Other factors affecting the difference between the direct and indirect oxygen determination and the use of direct oxygen analysis in determining the stoichiometry of coal are discussed, including differences between the ash and mineral matter contents, the oxygen content of the ash, generally 44 to 48%, and the reduction in indirectly determined oxygen in high-sulfur coals, which suggests that some of the sulfur, both organic and inorganic, competes for oxygen sites. 27 references, tables." @default.
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- W2276934343 date "1977-01-01" @default.
- W2276934343 modified "2023-09-24" @default.
- W2276934343 title "Oxygen determination and stoichiometry of some coals" @default.
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