Abstract
Humic acid from leonardite, an immature coal, has been examined by spectroscopic methods (UV-VIS, IR-FT, 1H, 31P, 13C-NMR), mass spectrometry (FAB-MS) and thermal analysis. These techniques provided complementary informations. A quantitative 13C-NMR technique was applied to this humic acid: the aromaticity calculated from the NMR data is high, about 76%, in agreement with mass spectrometric and thermal analysis data.
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