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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Identification of Leonardite, a Naturally Oxidized Lignite, by Low-Angle X-ray Scattering Method
Paul L. Broughton
ABSTRACT
Leonardite is a naturally oxidized lignite characterized by high percentages of humic acids. Visual inspection is usually insufficient to distinguish leonardite from lignite. The low-angle X-ray scatterings from 8-2.5A° of lignite, leonardite and humic acids were analyzed. The primary subpeak shifts from 3.37A° for leonardite to 3.44-3.58A° for lignite and vitrinite. Leonardite and lignite can also be distinguished by examining the relative intensities of the 3.1-3.7A° sub-peak.
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