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Free-liquid electrophoresis was used for the study of thorium complexation with Aldrich humic acid (HA) in aqueous solutions of 0.01 M (NaClO 4 +HClO 4  or NaOH) with dependence on pH and concentration of thorium (≤10 -9 −10 -5  M, labelled with   234 Th) and HA (0.1−10 mg/L). The abundances and the mean electrophoretic mobilities of thorium humate complexes were calculated from the electrophoretic mobilities of thorium measured. It has been found that negatively charged humate complexes dominate in the solutions of pH 2–11 containing 1−10 mg/L HA and up to 0.001 M HCO 3  - . Experimental evidence was given of the formation of Th(OH) 4 HA  y  -  complex at pH 8–11 and its stability constant was determined. New conclusions about spontaneous association of HA molecules at pH 2–6 and about binding of thorium by non-dissociated carboxyl groups of HA were drawn.

Radiotracer study of thorium complexation with humic acid at pH 2–11 using free-liquid electrophoresis