Abstract
AbstractInfrared (IR) spectroscopy, between 2,000 and 1,000 cm−1, was used to identify the mode by which carboxylates of a soil humic acid (HA) complexed Cu2+ and Fe3+. Carboxylic acid groups of HA (R‐COOH) were converted to carboxylates (R‐COO‐) by forming coordinate bonds with Cu2+ and Fe3+. The separation Δ of the antisymmetrical and symmetrical stretching vibrations of R‐COO‐ was obtained from the IR spectra of the metal‐HA complexes. The Δ values for the metal‐HA complexes were significantly larger than the corresponding reference value of Δ for uncomplexed ‐COO‐, demonstrating that R‐COO‐ formed a unidentate complex (i.e., a single M‐O bond) with Cu2+ and Fe3+. The formation of bidentate or bridging complexes between R‐COO‐ of HA and Cu2+ or Fe3+ was not observed.
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