2.3. Sensor description, characterization and calibration
The sensor assembly was composed of three carbon rod
(length = 30 mm; Ø = 300 lm, 2H staedtler graphite pencil leads)
electrodes. The working electrode was coated with a thin insulating
layer of epoxy resin and the active surface was ellipsoidal.
Three millimetres of non-insulated carbon rod guaranteed good