Electrochemiluminescence of hydrogen peroxide-luminol at a carbon electrode

✍ Scribed by Sachiko Sakura

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 656 KB
• Volume: 262
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(92)80007-t

✦ Synopsis

AhSWCt

Electrochenulummescence (ECL) was used to detect hydrogen peroxide m aqueous solutions m the presence of electrolytically oxldlzed lummol Usmg a glassy carbon electrode, the ECL mechanism could be selected by the applied potential Lummol IS ondlzed to the excited mtermedlate (dlazaaenuqumone radical or dmzaqumone) at around 0 5 V vs SCE m pH 7 4 aqueous solution, above 10 V, hydrogen peromde IS oxldued to superoxlde and the ammo group of hnnmol IS also oxldlzed Therefore, the ECL mechamsm IS different dependmg on whether the apphed potential IS between 0 5 and 10 V or more posItwe At the higher potentials, complex fluorophores are involved On the other hand, at the lower potentials the fluorophore IS simple and the ECL spectrum shows a simple maximum emlsslon peak The quahty of the data obtamed at 0 7 V IS better than that at 1 2 V The detectlon hnnt of hydrogen peroxide IS 66 pmol with a relatwe standard devlatlon of 1 1% (n = 5