Premium
Infrared Studies on Humic Acid in Deuterium Oxide: I. Evaluation and Potentialities of the Technique
Author(s) -
MacCarthy Patrick,
Mark H. B.
Publication year - 1975
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1975.03615995003900040026x
Subject(s) - humic acid , deuterium , chemistry , infrared spectroscopy , infrared , absorption (acoustics) , proton , oxide , inorganic chemistry , salt (chemistry) , nuclear chemistry , absorption spectroscopy , analytical chemistry (journal) , materials science , environmental chemistry , organic chemistry , fertilizer , physics , quantum mechanics , optics , composite material
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 D 2 O 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 (D 2 O) 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.