Showing papers by "Alan L. Chaffee published in 1983"
TL;DR: In this article, the tri-and tetraaromatic hydrocarbon fractions of a brown coal sample from the Latrobe Valley, Victoria, Australia indicate the predominance of pentacyclic hydroaromatic components.
124 citations
TL;DR: This paper showed that hydrogen-rich triterpenoid components are predominantly associated with the lighter lithotypes, whereas hydrogen-deficient phenolic components are more abundant in pyrolysates from the darker lithotypes.
42 citations
TL;DR: In this article, pyrolysis-gas chromatography (Py-g.c.) was used to characterize quantitatively a series of high-to low-volatile bituminous Permian Australian coals.
19 citations
01 Jan 1983
TL;DR: Etude de la variation de la composition chimique en fonction du lithotype et de la profondeur sur des carottes de sondage obtenues d'une maniere continue dans le bassin Flynn de l'Etat de Victoria as discussed by the authors.
Abstract: Etude de la variation de la composition chimique en fonction du lithotype et de la profondeur sur des carottes de sondage obtenues d'une maniere continue dans le bassin Flynn de l'Etat de Victoria
14 citations
01 Jan 1983
TL;DR: In this article, the authors compared the variation in the organic chemical nature of the coal occurring as a function of depth for a series of (nearly) identical lignites with that occurring as the function of lithotype, and employed techniques giving both precise molecular level information and average structural characterization of the whole coal.
Abstract: Victorian brown coal occurs in randomly sequenced stratified layers, known as lithotypes, which are distinguishable by their air-dried colour, maceral composition and many physical and chemical properties. The five major lithotypes can be related to generalized paleoenvironments of deposition and are known to influence many coal utilization parameters. Across the thick coal intervals which occur (up to 300 m) there is a small increase in coal rank observable via parameters such as % carbon and % volatiles. The purpose of this paper is to contrast the variation in the organic chemical nature of the coal occurring as a function of depth for a series of (nearly) identical lithotypes with that occurring as a function of lithotype. The authors have employed techniques giving both precise molecular level information (e.g., the distribution of extractable lipid classes) and average structural characterization of the whole coal (e.g., parameters derived from IR, solid state /sup 13/C-NMR, etc.). All of these techniques have been able to provide much deeper insights into the varying nature of the coal than the conventional elemental and functional group type analyses which have been carried out extensively in the past. american lignites: CA and MG.
3 citations