ABSTRACT
The experiments were conducted using a Spectrophoresis 100 system equipped with a modular injector and high-voltage power supply, and a model Spectra FOCUS scanning CE detector (Thermo Separation Products, California, U.S.A.) connected to a Model Etacomp 486 DX 4-100 computer which processed the data using PC 1000 (Version 2.6) running under the OS/2 Warp program (Version 3.0). The analysis was performed in a
fused silica capillary which has a total length of 88 cm, an effective length of 58 cm, and an I.D. of 75 µm (Phenomenex, California, U.S.A.). The pHs of the solutions were measured with a Multiline P4 pH meter with SenTix glass electrode (WTW, Weilheim, Germany). All the solutions were filtered using a Phenex microfilter (25 mm, 0.45 µm) (Phenomenex) and were degassed using a model B-220 ultrasonic bath (Branson, Connecticut, U.S.A.).
