Abstract
Molecular weight determinations have been performed using low-angle laser light scattering photometry on derivatives of a series of humic acid macromolecules derived from lignite. The humate derivatives obtained from Beulah lignite by base extraction were shown to have molecular weights ranging from 1.3 × 10 6 to 4.3 × 10 5 daltons, low and high yield extractions respectively. Mild oxidation with p-nitroperbenzoic acid gave humic acids with slightly larger molecular weights, again inversely proportional to the yields. The nature of the aliphatic bridging groups in low-rank coals have been investigated by ruthenium tetroxide oxidations using isotope dilution GC/MS methods for analysis of the product carboxylic acids derived from oxidation of the aromatic portions of the coal.
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