Open AccessStability constants of complexes of metal ions with peatsoil humic acids under non-acid-conditions
Author(s) -
Y Sabo,
Wlo Jimoh,
Isa Baba Koki,
Q.O. Sholadoye
Publication year - 2021
Publication title -
bayero journal of pure and applied sciences
Language(s) - English
Resource type - Journals
ISSN - 2006-6996
DOI - 10.4314/bajopas.v14i1.8
Subject(s) - potentiometric titration , humic acid , chemistry , metal , stability constants of complexes , divalent , divalent metal , metal ions in aqueous solution , inorganic chemistry , aqueous solution , salt (chemistry) , titration , ion , nuclear chemistry , organic chemistry , fertilizer
Stability constants of complexes of four divalent metal ions viz. Cu2+, Pb2+,Mg2+ and Cd2+ with humic acids (HA) were determined by potentiometric titration of humic acids with the corresponding salt of the divalent metals in aqueous media under non-acid-condition. The log K (logarithm of the stability constant) ranged from 1.0942 to 2.7471 for metal-humic acid complexes were determined using point-wise computational method. The order of stability constants were obtained as follows: Cu >Pb> Cd > Mg for metal -HA complexes respectively, indicating a higher degree of complexation with Cu metal ion.