USE OF COBALT(II) PHTHALOCYANINE TO IMPROVE THE SENSITIVITY AND STABILITY OF GLASSY-CARBON ELECTRODES FOR THE DETECTION OF CRESOLS, CHLOROPHENOLS AND PHENOL
T. Mafatle et T. Nyokong, USE OF COBALT(II) PHTHALOCYANINE TO IMPROVE THE SENSITIVITY AND STABILITY OF GLASSY-CARBON ELECTRODES FOR THE DETECTION OF CRESOLS, CHLOROPHENOLS AND PHENOL, Analytica chimica acta, 354(1-3), 1997, pp. 307-314
A cobalt(II) phthalocyanine-modified glassy carbon electrode (CoPc-GCE
) was used for the detection of o-, In-and p-cresols, and of 2-chlorop
henol, 4-chlorophenol and phenol. Modification of the glassy carbon el
ectrode with CoPc increases the oxidation currents of these species an
d increases the stability of the electrode. CoPc-GCE showed less fouli
ng by the oxidation products of these compounds than the unmodified GC
E. Comparison of some first row transition metal phthalocyanines showe
d the following trend for the enhancement of the currents for he oxida
tion of cresols and phenols: Co(II)Pc>Mn(II)Pc>Fe(II)Pc>Ni(II)Pc>Cu(II
)Pc >H2Pc>Zn(II)Pc>GCE. When [Co(II)TSPc](4-)(TSPc=tetrasulfo Pc) was
added to aqueous solutions containing the cresols and phenols, an enha
ncement of the oxidation currents was also observed. (C) 1997 Elsevier
Science B.V.