SIMULTANEOUS DETERMINATION OF CATIONS BY CAPILLARY ELECTROPHORESIS WITH CONTACTLESS CONDUCTIVITY DETECTION PERFORMED IN A HOME-MADE EQUIPMENT

SIMULTANEOUS DETERMINATION OF CATIONS BY CAPILLARY ELECTROPHORESIS WITH CONTACTLESS CONDUCTIVITY DETECTION PERFORMED IN A HOME-MADE EQUIPMENT. This work describes the development of a home-made capillary electrophoresis (CE) system based on the capacitively coupled contactless conductivity detection ((CD)-D-4) for the separation of the metallic species Zn2+, Cr3+, Pb2+, Cd2+, Co2+, Cu2+, Ni2+ e Tl+. A background electrolyte composed of MES/Histidine 0,02 mol L-1 (pH 5.0) was optimized for the separation of the metallic species by using organic solvents and complexing agents as additives. The system allowed the determination of the metallic species using MES/Histidine 0,02 mol L-1 and methanol 5% (pH 5.0) as a background electrolyte, 15 kV separation voltage and hydrodynamic injection by gravity.