Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
39, Number 9, September 2001, pp. 397-401
Direct
Analysis of Inorganic Anions in Samples with High Salt Content by Capillary
Zone ElectrophoresisM.I.
Turnes Carou, P. López Mahía, S. Muniategui Lorenzo, E. Fernández
Fernández, and D. Prada Rodríguez
Department of Analytical Chemistry, University of A Coruña, A Zapateira,
15071 A Coruña, Spain
Trace-level inorganic anions in seawater are separated efficiently
by capillary zone electrophoresis using direct UV detection. The carrier electrolyte
is 50mM borate at pH 9.3 and contained 1.5M NaCl. This buffer solution is adopted
to prevent interference from high concentrations of the chloride ion in seawater.
No electro-osmotic flow reverser is used to shorten the analysis time. The experimental
conditions such as the concentration of NaCl in the carrier electrolyte, capillary
inner diameter, applied current, and temperature are optimized. Linear plots
are obtained in the concentration range of 0.1 to 20 µg/mL. The quantitation
limits of the anions are in the order of 0.02 to 0.1 µg/mL. The proposed
method may be applicable to the determination of inorganic anions in other environmental
samples and effluents of a power plant.
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