%0 Journal Article
%T CHARACTERIZATION OF THE COAL HUMIC ACIDS FROM THE CANDIOTA COALFIELD, BRAZIL
%A Xavier D.M.
%A Silva A.S.
%A Santos R.P.
%A Mesko M.F.
%A Costa S.N.
%A Freire V.N.
%A Cavada B.S. and Martins J.L.
%J International Journal of Agriculture Sciences
%D 2012
%I Bioinfo Publications
%X Humic acid (HA) is a principal component of humic substances, which are the major organic constituents of soil, peat, coal, many upland streams, dystrophic lakes and ocean water. HA has an important impact on a variety of environment processes. This work aimed to characterize the HA extracted and purified from the Candiota coalfield (Brazil) by visible (VIS), Fourier transform infrared (FTIR), energy dispersive X-ray (EDX), inductively coupled plasma absorption emission (ICP-AES), and X-ray diffraction (XRD) spectroscopies, thermogravimetry (TG), differential thermal analysis (DTA), and scanning electron microscopy (SEM). The results of these analyses showed that Candiota HA presents a high degree of humification, which is considered to be type A with a turbostratic structure. The elemental analysis (EDX/ICP-AES) indicated the presence of low concentrations of heavy metals.
%K Humic acid
%K coal
%K characterization
%K spectroscopy
%K thermal analyses.
%U http://bioinfopublication.org/viewhtml.php?artid=BIA0000024