Yh. Tse et al., ELECTRODE WITH ELECTROCHEMICALLY DEPOSITED ETRAMETHYLTETRA-3,4-PYRIDINOPORPHYRAZINO-COBALT(I) FOR DETECTION OF SULFIDE ION, Analytical chemistry, 66(3), 1994, pp. 384-390
Electroreduction of etramethyltetra-3,4-pyridinoporphyrazinocobalt(II)
in aqueous buffer phosphate solution leads to the deposition of an in
soluble tetrapyridinoporphyrazinocobalt(I) phthalocyanine film on the
highly oriented pyrolytic graphite (HOPG) electrode. This modified HOP
G electrode has been further coated with Nafion or Tosflex ion-exchang
e membranes and used in the determination of concentration of sulfide
ion and 2-mercaptoethanol by direct potentiometry.