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Adsorption voltammetry of the copper-4-[(4-diethylamino-2-hydroxyphenyl)azo]-5-hydroxynaphthalene-2,7-disulphonic acid (Beryllon III) system

✍ Scribed by Jingzhong Zhao; Dezhi Sun; Wenrui Jin

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 490 KB
Volume: 268
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(92)85223-s

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✦ Synopsis

A sensltlve adsorptive voltammetnc procedure for the determmatlon of trace copper, based on the adsorption charactenstlcs of the copped111 complex wth Beryllon III at a hangmg mercury drop electrode (HMDE), IS described The results show that the best base solution consists of 0 02 mol I-' acetIc acid, 0 005 mol 1-l sodmm acetate and 1 x 10m6 mol 1-l Beryllon III The hnut of detectlon and the linear range of the denvatlve linear sweep adsorption voltammetnc method are 5 x lo-" and 1 X 10w9-2 X 10e7 mol I-', respectively The method was apphed to samples of dlgested human hau and to dlstdled water The electrochenucal behavlour of the copper complex with Beryllon III at the HMDE was also mvestlgated m this medmm AdsorptIon phenomena were observed The mechanism of the electrode reaction was found to be reduction of the copper complex adsorbed on the surface of the electrode by a totally Irreversible charge transfer to metal amalgam,

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