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Issue 4, 2005
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Sensitive determination of heroin based on electrogenerated chemiluminescence of tris(2,2′-bipyridyl)ruthenium(II) immobilized in zeolite Y modified carbon paste electrode

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Abstract

A novel method for rapid, inexpensive, sensitive and selective determination of heroin was proposed by flow injection electrogenerated chemiluminescence (ECL). Zeolite Y sieves were used for the preparation of a ECL sensor by immobilizing tris(2,2′-bipyridyl)ruthenium(II) (Ru(bpy)32+) in their supercages, which was achieved through the ion exchange properties of the sieves. The electrochemical and ECL behaviors of Ru(bpy)32+ immobilized in zeolite Y modified carbon paste electrode was investigated. The immobilized Ru(bpy)32+ displayed a pair of surface-controlled redox peaks with an electron transfer rate constant of 1.2 ± 0.1 s−1 in 0.1 mol dm−3 pH 6.3 phosphate buffer. The modified electrode showed an electrocatalytic response to the oxidation of heroin, producing a sensitized ECL signal. The ECL sensor showed a linear response to flow injection of heroin in the range of 2.0–80 µmol dm−3 with a detection limit of 1.1 µmol dm−3. This method for heroin determination possessed good sensitivity and reproducibility with a coefficient of variation of 1.99% (n = 15) at 50.0 µmol dm−3. The ECL sensor showed good selectivity and long-term stability. Its surface could be renewed quickly and reproducibly by a simple polish step.

Graphical abstract: Sensitive determination of heroin based on electrogenerated chemiluminescence of tris(2,2′-bipyridyl)ruthenium(ii) immobilized in zeolite Y modified carbon paste electrode

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Publication details

The article was received on 05 Oct 2004, accepted on 01 Feb 2005 and first published on 18 Feb 2005


Article type: Paper
DOI: 10.1039/B415430D
Citation: Analyst, 2005,130, 534-540
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    Sensitive determination of heroin based on electrogenerated chemiluminescence of tris(2,2′-bipyridyl)ruthenium(II) immobilized in zeolite Y modified carbon paste electrode

    Y. Zhuang, D. Zhang and H. Ju, Analyst, 2005, 130, 534
    DOI: 10.1039/B415430D

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