Rapid detection by FTIR spectroscopy of the competition of Hg (II) and Pb (II) on the functional sites of humic acid.

M.C. Terkhi, M.R. Ghezzar, A. Addou

Abstract


Abstract: This work shows that infrared spectroscopy is an easy and fast analytical technique for monitoring the behavior of the humic acids Fluka (impure) and Leonardite (pure) in contact with binary solutions of mercury and lead. The results showed the high fixation capacity of humic acids for mercury compared to lead and the adsorption rate of Fluka is always higher (for Hg 99%; and lead 96%) than Leonardite (Hg 70%; lead 42%). The spectra showed a shift (30 cm-1) of the asymmetric stretching vibration band from the carboxylate function -COO- for the humic acids Fluka-binary solution interaction. In the case of mercury alone, the shift was of 40 cm-1and has decreased by 10 cm-1.  That is proves that the cationic exchange becomes more difficult. The spectra also showed the variation of the intensity of the C=O elongation vibration band of the carboxylic function -COOH up to 1610 cm-1 for the Leonardite humic acid-binary interaction. The high concentration of the binary solution did not result in the total disappearance of the C=O band as in the Leonardite humic acid-mercury alone interaction study. This proves that some carboxylic sites are not accessible to Hg2+ ions. These results were confirmed by monitoring the pH before and after ion exchange during the humic-binary acid (Hg-Pb) interaction. It appears that the -COONa or -COOCa to -COOM type transitions in Fluka humic acid were easy rather than the -COOH to -COOM type transitions in Leonardite humic acid.

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