Bf. Liu et al., SEPARATION OF THORIUM, URANIUM AND RARE-EARTH ELEMENTS WITH 4,6-TRIBROMOPHENYL)AZO]-NAPHTHALENE-3,6-DISULFONIC ACID BY CAPILLARY ELECTROPHORESIS, Analytica chimica acta, 358(2), 1998, pp. 157-162
The separation of thorium, uranium and rare-earth elements (RE) as the
ir 4,6-tribromophenyl)azo]-naphthalene-3,6-disulfonic acid complexes b
y capillary electrophoresis with direct UV-Vis detection is presented
in this paper. The influences of pH value and concentration of electro
lyte, voltage and surfactant on separation were investigated and optim
ized. Under the selected conditions (30 mM NaAc-HCl buffer containing
0.5 mM cetyltrimethylammonium bromide and 0.2 mM chelating reagent, pH
4.30, 12 KV, 635 nm as detection wavelength), the coexisted ions were
separated within 4 min, and limits of detection of 37, 39, 199 mu g 1
(-1) for RE, thorium, uranium with a linear dynamic range of over 2 or
ders of magnitude were achieved, respectively. (C) 1998 Elsevier Scien
ce B.V.