Determination of ultra trace concentrations of selenium using the GFAAS technique following on-line electrochemical pre-concentration on a gold-coated porous carbon electrode.

In this work the possibility of determination of selenium in water samples was studied by on-line coupling of electrochemical pre-concentration flow through unit and GFAAS. The pre-concentration unit was created from a commercial electrochemical flow through analyser EcaFlow (Istran Ltd.) and a special two-electrode electrochemical flow through cell.