Cobalt / Nickel / Humic substances / Acid dissociation constants / High ionic strengthSummary. Complexation of Ni(II) and Co(II) by unfractionated humic acid (HA) was measured in 0.3 to 5.0 m NaCl solutions at pH 6 and 20 • C, using a solvent extraction technique. The dissociation constants and capacities of the humic acid were investigated in 0.1 to 5.0 m NaCl solutions at 25 • C using potentiometric titration methods.
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