Journal
CHEMOSPHERE
Volume 84, Issue 11, Pages 1548-1555Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2011.05.046
Keywords
Humic acids (HA); Sediment; EPR; IR; UV/VIS; Free radical
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Funding
- Ministry of Science and Higher Education (MNiSW Poland) [N N204 1932 33]
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Goczalkowice Reservoir is the biggest water reservoir in the south of Poland. For our studies bottom sediments were collected from eight different places of the reservoir at various seasons of the year. EPR spectroscopy was applied to analyse both quantitatively and qualitatively the humic acids (HA) present in the samples. EPR spectra of the extracted HA exhibited broad lines from the paramagnetic metal ions and narrow lines from free radicals. The values of the free radical concentration obtained for HA amounted to 1.14-13.6 x 1016 spin g(-1) depending on the season and the place of sample collection. The values of the g factor obtained for HA were of the range 2.0027-2.0035. The EPR studies show that HA extracted from bottom sediment collected at various points of the Goczalkowice Reservoir exhibit similar physical-chemical properties. It was also observed that the depth of the reservoir affects the content of the oxygen functional groups as well as the free radical concentration in HA. The identification of the functional groups was done by means of IR. UV/VIS spectroscopy was used to estimate the maturity of the HA. (C) 2011 Elsevier Ltd. All rights reserved.
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