Conductive carbon cement as electrode matrix for cobalt phthalocyanine modified electrodes for detection in flowing solutions

✍ Scribed by Xinjian Huang; Wim Th. Kok

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 685 KB
• Volume: 273
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(93)80164-g

✦ Synopsis

A comparison has been made of the performance of electrodes modfied with cobalt phthalocyanme catalyst prepared m different ways for use m flowing solutions Because of leachmg direct adsorptlon of cobalt phthalocyanine (CoPC) on a glassy carbon electrode surface had httle analytical utdlty Use of a polystyrene tilm prevents leaching of CoPC from the electrode surface to some extent, albeit at the expense of sensltmty A new composde electrode Hrlth conductive carbon cement as electrode matnx was found to be comparable to a carbon paste electrode m terms of the electrocatalytlc propeties of CoPC towards thlol compounds (N-acetylcystemc, cysteme, glutathlone and dlthlothreltol) both m qmescent and flowmg solutions, but IS obviously supenor m terms of long-term stability m flowmg solutions An advantage of the use of conductlve carbon cement IS that it can be repacked, so that the normal electrode body for carbon paste can be utthzed The modified electrode has been applied m hqmd chromatography for the determmatlon of cysteme m unne samples The decrease of the electrode sensitMty over 5 h was about 5% at a flow-rate of 18 ml mm-' and a fixed potential of 0 7 V vs Ag/AgCl Zkywords Flow m]ectlon, Llqmd chromatography, Carbon cement, Cobalt phthalocyamne, Modified electrodes, Thlols.