A novel solid-contact potentiometric sensor for ascorbic acid based on cobalt phthalocyanine nanoparticles (NanoCoPc) as ionophore was
fabricated without any need of auxiliary materials (such as membrane matrix, plasticizer, and other additives). The electrode was prepared by
simple drop-coating NanoCoPc colloid on the surface of a glassy carbon electrode. A smooth, bright and blue thin film was strongly attached
on the surface of the glassy carbon electrode. The electrode showed high selectivity for ascorbic acid, as compared with many common anions.
The influences of the amount of NanoCoPc at the electrode surface and pH on the response characteristics of the electrode were investigated.
To overcome the instability of the formal potential of the coated wire electrode, a novel electrochemical pretreatment method was proposed
for the potentiometric sensor based on redox mechanism. This resulting sensor demonstrates potentiometric response over a wide linear
range of ascorbic acid concentration (5.5 × 10−7 to 5.5 × 10−2 M) with a fast response (