Abstract
Fourier transform infrared spectroscopy and Mössbauer spectroscopy are use for the characterization and qualitative analysis of hydrolysable and condensed tannates. The two classes of tannates may be differentiated from the characteristic IR pattern. Mössbauer proof that a mixture of mono- and bis-type ferric tannate complexes, and an iron(II)-tannin complex are obtained from the interaction of hydrolysable tannins (tannic acid and chestnut tannin) and condensed tannins (mimosa and quebracho) with a ferric nitrate solution. At pH 7, a partially hydrolyzed ferric tannate complex was also obtained.
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Jaén, J.A., Navarro, C. Mössbauer and infrared spectroscopy as a diagnostic tool for the characterization of ferric tannates. Hyperfine Interact 192, 61–67 (2009). https://doi.org/10.1007/s10751-009-9947-2
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DOI: https://doi.org/10.1007/s10751-009-9947-2