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Infrared Studies on Humic Acid in Deuterium Oxide: I. Evaluation and Potentialities of the Technique¹

ABSTRACT

Infrared spectra of deuterated humic acid and sodium humate and the Cu(II), La(III), and Fe(III) complexes of deuterated humic acid were recorded in D₂O medium. Changes in the 1550 cm^-1 to 1750 cm^-1 region of the humic acid spectrum which occur on salt- and complex-formation were readily observed in the wet (D₂O) slurry samples. Replacement of active protons in humic acid by deuterium (D) eliminates the broad O-H absorption band which occurs in the 2900 cm^-1 to 3600 cm^-1 region of the spectrum of the H-form of humic acid. Consequently, the aliphatic C-H stretching bands which occur at 2860 and 2920 cm^-1 in the spectrum of humic acid are observed with negligible background absorption and with little interference from the O-D stretching band which occurs in the 2200 cm^-1 to 2800 cm^-1 region. The deuterium-proton exchange reactions in humic acid were found to be rapid.

¹ Contribution from the Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221. Presented before Div. S-2, Soil Science Society of America, Chicago, Ill., 15 Nov. 1974. This research was supported in part by the National Science Foundation, Grant No. GP-35979.

² Graduate student and Professor of Chemistry, respectively, Department of Chemistry, Univ. of Cincinnati.

Received for publication November 22, 1974. Accepted for publication February 10, 1975.