Abstract
In this study, a polymer with characteristics analogous to that of the humic acid was obtained through oxidative polymerization in alkaline medium using para-benzoquinone as precursor, and compared to natural humic acid (HA) extracted from a soil. Complexes of as-prepared synthetic humic acid (SHA) with the Cu2+, Fe3+ and Mn2+ ions were also prepared. Elemental analysis and thermogravimetry were used for comparing the SHA characteristics with those of HA and for evaluating the effect of the metal-type for complexing with SH and SHA. Element analysis showed that SHA presented almost the same atomic constitution of HA, except for or sulfur and nitrogen contents, fact that is expected due to the precursor compounds. TGA curves of HA and SHA are quite similar in spite the thermogravimetic index (TGI) indicates higher aromatic portion in SHA. SHA-metallic ions (SHA-Cu2+, SHA-Fe3+ and SHA-Mn2+) complexes presented different thermal stability as compared among them and with the precursor SHA. The data indicate that the complexation is dependent of metallic ion-type and provokes different rearrangements in the SHA matrix.
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