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Title: Comparative study of binding strengths of heavy metals with humic acid
Authors: Kostić, Ivan 
Andelković T.
Nikolić R.
Cvetković T.
Pavlović D.
Bojić, Aleksandar 
Issue Date: 3-Dec-2013
Journal: Hemijska Industrija
Abstract: The complexation of humic acid with certain heavy metal ions (Co(II), Ni(II), Cu(II), Zn(II) and Pb(II)) was investigated. The stability constants of humate complexes were determined by a method based on the distribution of metal ions between solution and resin in the presence and the absence of ligand, known as Schubert's ion exchange method. Experiments were performed at 25 °C, pH 4.0 and ionic strength of 0.01 mol dm-3. It was found that the 1:1 complexes were formed between metal ions and humic acid. Obtained results of the stability constants, log βmn, of complexes formed between the metal ions and humic acid follow the order Co(II) < Ni(II) < Cu(II) > Zn(II), which is the same as in the Irving-Williams series for the binding strength of divalent metal ion complexes. The stability constant of complex between Pb(II) ions and humic acid is greater than the stability constants of other investigated metal-humate complexes. The investigation of interaction between heavy metal ions and humics is important for the prediction of the distribution and control of the migration of heavy metals in natural environment.
ISSN: 0367598X
DOI: 10.2298/HEMIND121107002K
Appears in Collections:Naučne i umetničke publikacije

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