PREPARATION CONDITIONS OF HUMIC ACIDS FROM VILLAGE'S COMPOST FUEL (VCF) AND THEIR EFFECTS ON HUMIC ACIDS CHEMICAL CHARACTERISTIC ALTERNATION DURING ISOLATION PART II. EFFECT OF THE EXTRACTION CONDITIONS ON THE FUNCTIONAL GROUPS CONTENTS OF HUMIC ACIDS AS REVEALED BY SPECTROSCOPIC ANALYSIS

Document Type : Original Article

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Chemistry Department, Faculty of Science, Al-Azhar University (For Girls)

Abstract

IR spectra of humic acids ( HAs) extracted by  NaOH solution under different conditions  showed that  HAs extracted by 0.1 M after 6h  and 16 h have identical finger print regions. These spectra indicate the presence of highest number of  functional groups and highest aromatic COOH group content, in comparison with ( HAs) extracted by 0.1M after 2h  and 24 h. IR spectrum of humic acids  HAs extracted by 0.2M after 2h was generally similar with the two latter spectra. The IR spectra of HAs extracted after 2h by 0.5M, 1M, and 2M not only show the disappearance of aromatic COOH bands but also indicate the hydrolysis of ester moieties and increase the OH groups content of the extracted HAs. The IR spectra of HAs extracted at the latter three concentrations showed attacked finger print regions. Uv-Vis spectra show two clearly observable peaks at 208 and 280 nm which are characteristic to these humic acids. The spectral change of the latter are in agreement with the results obtained by IR analysis  According to results obtained,  the extraction by 0.1M NaOH after 16h leads to production of HAs of highest condensation, highest functional group content. 

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