Il. De Mattos et al., Sensor for hydrogen peroxide based on Prussian Blue modified electrode: Improvement of the operational stability, ANAL SCI, 16(8), 2000, pp. 795-798
Improvement of the operational stability of amperometric sensors based on P
russian Blue (PB) modified glassy carbon electrodes is presented. The long
term performance of the sensors was evaluated by injection of hydrogen pero
xide (5 mu M in potassium buffer) solutions in a flow-injection system duri
ng a period of 5 - 10 h. The following parameters were investigated and cor
related with the performance of the sensor: the times for electrodeposition
and electrochemical activation, temperature, storage time, pH, composition
of the buffer solution and of volume sample injected. These analytical cha
racteristics of the modified electrode can be emphasized: initial sensitivi
ty of 0.3 A cm(-2) M-1, detection limit of cn. 0.5 mu M, precise results (r
.s.d.< 1.5%) and possibility to carry out around 50 samples (50 mu L) per h
our.