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A COMPARATIVE STUDY OF SOUTH MORAVIAN LIGNITE AND STANDARD IHSS HUMIC ACIDS´ OPTICAL AND COLLOIDAL PROPERTIES

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Author(s): Naděžda Fasurová | Hana Čechlovská | Jiří Kučerík

Journal: Petroleum and Coal
ISSN 1337-7027

Volume: 48;
Issue: 2;
Start page: 24;
Date: 2006;
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Keywords: humic acids | synchronous fluorescence spectroscopy | humification index | zeta potential

ABSTRACT
Optical and colloidal properties of humic acids isolated from South Moravian lignite and IHSS standards were assessed by emission, excitation and synchronous fluorescence spectroscopy, UV-VIS spectroscopy and by means of zeta potential measurement. Obtained results indicated a high aromaticity of lignite humic acids which causes a strong inner filter effect in fluorescence measurement. As a result, lignite sample showed the lowest fluorescence intensity. The comparison of obtained records as well as humication indexes calculated from UV and fluorescence spectra did not show any correlation with the elemental composition or zeta potential values of humic acids under study. The results indicate that the optical and colloidal properties of humic acids of different origin can not be explained on the base of simple molecular composition. Therefore, also the nature of secondary structure must be taken into consideration.
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