Abstract
Heating preformed KBr pellets effectively eliminated interference arising from hygroscopic moisture in infrared studies of humic acids. Structural changes in humic acid during heating were confined to the formation of cyclic anhydrides from carboxy1 groups. The use of thallous bromide as a nonhygroscopic pelleting matrix and perfluorokerosene as a mulling agent can be recommended in infrared investigations of humic substances.
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