C - Lublin
C - Lublin
C - Lublin
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Transmittance<br />
A2-C2<br />
C2-A1<br />
Fig. 2. FTIR difference spectra<br />
recorded for HA fractions (Tab.1).<br />
A3-C3<br />
3400 2900 2400 1900 1400<br />
Wavenumber (cm-1)<br />
900<br />
400<br />
We conclude that sequential resin-alkali extraction procedure provides some<br />
separation of humic acids in respect to their association with specific compounds<br />
(such as aliphatics, carbohydrates, lignin-derived structures), coextracted/<br />
incorporated mostly to alkali-isolated material. The photophysical parameters of<br />
alkali-extracted humic acids may differ significantly from those of resin-extracted<br />
sub-fraction. Therefore resin-alkali technique offer advantages over the classical<br />
acid-alkali isolation procedure in studying of humic acids.<br />
This work was supported by USA Fulbright Foundation.<br />
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