Construction of multi-electrodes electrochemical detection system for flow-injection analysis (FIA( : application to Cu1 + Cu2 + Couple

الملخص EN

A house-built multi-electrodes detector has been designed for flow-injection electrochemical analysis.

The detection system constructed intwo part, the auxiliary electrode (1 mm diameter Pt wire), the working electrodes (5 mm diameter glassy carbon (GC)), 5 mm diameter graphite (GR) and 5 mm diameter poly pyrrole plated (PPPE) as conducting polymer) placed in one part where as the reference electrode (Ag / AgCl,sat.

KC1) placed in the second part.

These electrodes were fitted into a teflon body cell, as it is a good isolator and easy to machine.

One can readily change the working electrodes from GC, GR or PPPE without taking the cell apart.

The cell based on a conventional laminar flow or on a wall-jet mode of operation.

Use of the cell is illustrated by determination of Cu1+ / Cu2 + couple on the different working electrodes.

The best results obtained using the conducting polymer with lowest detection limit 10-7 M (6.

3 ppb as Cu + 2 ion).