Investigation of solute-wall interactions in separation of uranium(VI) on lanthanides by capillary electrophoresis using on-capillary complexation with Arsenazo IIIстатья
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Дата последнего поиска статьи во внешних источниках: 11 апреля 2019 г.
Местоположение издательства:Eugene, Or., United States
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Аннотация:The separation of uranium VI. and lanthanides by capillary elec-
trophoresis CE. in the form of anionic complexes with arsenazo III in aqueous
background electrolytes was found to depend strongly on the chemistry of the
surface of the internal wall capillary. A recently developed separation scheme for
these complexes was used as a model for the evaluation of the solute]wall
interactions in which a number of capillaries with different charge, polarity,
hydrophobicity, and structure of bonded layer of the internal wall surface were
compared. Pretreatment of bare fused silica FS. capillaries with acid or alkali was
found to be very important: After treatment with sodium hydroxide, the observed
adsorption of the analytes was higher than for untreated FS capillaries. Capillaries
with a chemically bonded neutral hydrophilic layer also showed considerable
adsorption of the analytes. Strong adsorption of the negatively charged amphiphilic
molecules of ligand or metal complexes was observed for coated capillaries with a
positively charged wall, as well as for capillaries with a hydrophobic wall. Dynamic
coating of the bare FS capillary with Carbowax 20M provided better peak shapes
and shorter migration times owing to suppression of electroosmotic flow and
blockage of adsorption sites on the internal capillary wall. The best separation of
complexes of uranium and lanthanides with arsenazo III was achieved using an
untreated bare FS capillary dynamically coated with Carbowax 20M 350,000
theoretical plates for uranyl and 63,000 theoretical plates for lanthanum..