N. Avdalovic et al., DETERMINATION OF CATIONS AND ANIONS BY CAPILLARY ELECTROPHORESIS COMBINED WITH SUPPRESSED CONDUCTIVITY DETECTION, Analytical chemistry, 65(10), 1993, pp. 1470-1475
Capillary electrophoresis combined with suppressed conductivity detect
ion is a highly sensitive and selective method for the determination o
f UV-transparent ionic species. Using direct injection techniques (no
electrostacking), minimum detection limits for common organic and inor
ganic ions are in the range of 1-10 ppb. Suppressors are made from sho
rt ion-exchange membrane capillaries and are placed between the separa
tion capillary and the detector cell. The suppressor is placed in the
destination vial, which contains regenerant and the ground electrode.
The method is dependent on the presence of electroendoosmotic flow in
the capillary to transport analyte and buffer ions through the suppres
sor.