CHARACTERISTICS OF THE HUMIC ACIDS (HA) FROM LAKE SEDIMENTS AS EFFECT OF UV-VIS SPECTRAL PARAMETERS APPLICATION
Lilla Mielnik
Department of Physics and Agrophysics, West Pomeranian University of Technology in SzczecinAbstract
In this work, samples of humic acids (HA) extracted from six lake sediments were investigated. HA were isolated with method of two-stage successive extraction (A) – extraction with an neutral solution 0.1 mol L-1 Na4P2O7 and (B) – extraction with an alkaline solution 0.1 mol L-1 NaOH). It is observed that HA-B are characterized by relatively higher H and O contents than it is observed in HA-A. Also the stable fraction of HA-B are characterized by higher oxidation degree than HA-A fraction loosely associated with mineral part. Analysis of optical parameters showed that the labile fractions of HA-A are characterized by a higher capacity to absorb the UV-Vis radiation than the stable HA-B, as indicated by higher specific absorbance coefficients e280 and e600. The results indicated that the HA-B extracted by alkaline solution are a more complex structure, larger molecular size and molecular weight and higher condensed of aromatic nuclei than HA-A separated by neutral pyrophosphate solution
Keywords:
humic substances, lake sediments, UV-Vis spectroscopyReferences
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Department of Physics and Agrophysics, West Pomeranian University of Technology in Szczecin
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