FRESENIUS ENVIRONMENTAL BULLETIN, cilt.26, sa.6, ss.3733-3739, 2017 (SCI-Expanded)
Humic acid is a principal component of humic substances, which is the major organic constituents of soil, coal, peat, many upland streams, dystrophic lakes, and ocean water. It is produced by the biodegradation of dead organic matters. Humic substances contain major groups for chemistry, such as polyphenols, polycarboxylic acids, carbonyl groups, and peroxides. The presence of carboxylate and phenolate groups gives the humic acids the ability to form complexes with ions such as, Fe2+, Fe3+, Mg2+, and Ca2+.