Radiotracer study of thorium complexation with humic acid at pH 2–11 using free-liquid electrophoresis
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Petr Benes
Abstract
Free-liquid electrophoresis was used for the study of thorium complexation with Aldrich humic acid (HA) in aqueous solutions of 0.01 M (NaClO4+HClO4 or NaOH) with dependence on pH and concentration of thorium (≤10-9−10-5 M, labelled with 234Th) 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 HCO3-. Experimental evidence was given of the formation of Th(OH)4HAy - 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.
© by Oldenbourg Wissenschaftsverlag, München, Germany
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Articles in the same Issue
- Influence of pH and metal ion loading on the Cm(III) humate complexation: a time resolved laser fluorescence spectroscopy study
- Radiotracer study of thorium complexation with humic acid at pH 2–11 using free-liquid electrophoresis
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- Extraction behavior of short-lived isotopes of Mo/W using α-benzoinoxime: A model system for the study of seaborgium
- Production of 95gTc via95Ru decay
- A novel 188W/188Re electrochemical generator with potential for medical applications
- Influence of dose rate on the radiolytic stability of a BTBP solvent for actinide(III)/lanthanide(III) separation
- Study of some Ayurvedic Indian medicinal plants for the essential trace elemental contents by instrumental neutron activation analysis and atomic absorption spectroscopy techniques
- Epithermal neutrons activation analysis, radiochemical and radiometric investigations of evaporitic deposits of Slanic-Prahova (Romania) salt mine
