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Improved selectivity of anions with methanol as additive:Determination of Cl −, NO 3 − and SO 4 2− in river water by capillary electrophoresis

Authors
Journal
Journal of Chromatography A
0021-9673
Publisher
Elsevier
Publication Date
Volume
834
Identifiers
DOI: 10.1016/s0021-9673(98)00859-0
Keywords
  • Inorganic Anions
  • Chloride
  • Nitrate
  • Sulfates

Abstract

Abstract A method for separation and determination of Cl −, NO 3 − and SO 4 2− in river water by capillary electrophoresis with indirect UV detection was described. A background electrolyte consisting of sodium borate, chromate and cetyltrimethylammonium bromide (CTAB) was employed for the separation. Methanol as additive was added to the system for improving separation selectivity of NO 3 − and SO 4 2− through adjusting the elution order of anions. High concentrations of SO 4 2− did not interfere with the determination of NO 3 − because SO 4 2− was eluted later than NO 3 −. The effects of the concentration of sodium borate and CTAB on separation were also examined. The detection limits of Cl −, NO 3 − and SO 4 2− were 1·10 −7 mol/l. The concentration of Cl −, NO 3 − and SO 4 2− in river water was determined quantitatively using NO 2 − as an internal standard. Standard addition recoveries of the Cl −, NO 3 − and SO 4 2− in the river water sample were between 89∼105%. The results were consistent with those obtained by ion chromatography.

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