by Halbos, Mazin
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Earlier studies in our laboratory indicated oxidation of humic acid by Fe(VI) but the quenching of fluorescence by a reaction product Fe(III) led to uncertainty about the extent of oxidation. The interactions of Fe(VI)/Fe(III) with the humic acids (HAs) are investigated using synchronous scan fluorescence (SSF) spectroscopy, UV-Vis spectroscopy and DART-MS spectroscopy. In the fluorescence study, there was an immediate decrease in the SSF intensity after addition of both Fe(VI) and Fe(III) to all the HA mixtures, which suggested that there is a reaction between HAs with Fe(VI) as well as Fe(III). These reactions were further investigated quantitatively by UV-vis spectroscopy. The results show that the HAs oxidize immediately after the addition of Fe(VI). Also, HAs react with Fe(III), forming a complex between the functional groups of HA and Fe(III). These interactions were further investigated by with pH change and by DART-MS. The results show a greater number of lower m/z peaks after mixing of HAs with Fe(VI) than before mixing, suggesting that the oxidation of the HAs by Fe(VI) leads to the fragmentation of these HAs.
LAP Lambert Academic Publishing
Mr. Mazin Halbos was born in Najaf- Iraq. He studied in the United State in Florida Institute of Technology where he successfully completed Master Degrees a M.Sc. in Chemistry. His Thesis was successfully defended in November 10, 2014 entitled: Investigation of the Humic Acid Response to Ferrate (VI) and Iron (III) by Fluorescence Spectroscopy....
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19 May 2017
0.22 x 0.15 x 0.006 m; 0.209 kg