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Magnetite nanoparticles (Fe3O4) coated humic acids (HA) by a co-precipitation method using ammonium hydroxide. The HA was extracted from peat soil of Sambutan, East Kalimantan, Indonesia and then have been succesfully coated onto the surface of Fe3O4. Characterization of FT-IR spectra indicate that the coating Fe3O4/HA have been bound by Fe-COOR chemical bond. The XRD measurements does not affect...