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ASPTA Baner

Vol. 15 No. 3-4 (2016)

Artykuły

CHARACTERISTICS OF THE HUMIC ACIDS (HA) FROM LAKE SEDIMENTS AS EFFECT OF UV-VIS SPECTRAL PARAMETERS APPLICATION

Submitted: June 19, 2020
Published: 2020-06-19

Abstract

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

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