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Titolo:
Electrochemical study of a metallothionein modified gold disk electrode and its action on Hg2+ cations
Autore:
Ju, HX; Leech, D;
Indirizzi:
Natl Univ Ireland Univ Coll Galway, Dept Chem, Galway, Ireland Natl Univ Ireland Univ Coll Galway Galway Ireland Chem, Galway, Ireland Nanjing Univ, Inst Analyt Sci, State Key Lab Coordinat Chem, Dept Chem, Nanjing 210093, Peoples R China Nanjing Univ Nanjing Peoples R China 210093jing 210093, Peoples R China
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 2, volume: 484, anno: 2000,
pagine: 150 - 156
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIFFERENTIAL-PULSE POLAROGRAPHY; 56-61 MT-I; CYCLIC VOLTAMMETRY; CADMIUM-METALLOTHIONEIN; THIOLATE CLUSTERS; CARBON ELECTRODES; ZINC; BEHAVIOR; MERCURY; MOLECULES;
Keywords:
chemically modified electrodes; self-assembled monolayer; metallothionein; gold disk electrode; determination of Hg(II); cathodic stopping voltammetry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Leech, D Natl Univ Ireland Univ Coll Galway, Dept Chem, Galway, Ireland Natl Univ Ireland Univ Coll Galway Galway Ireland way, Ireland
Citazione:
H.X. Ju e D. Leech, "Electrochemical study of a metallothionein modified gold disk electrode and its action on Hg2+ cations", J ELEC CHEM, 484(2), 2000, pp. 150-156

Abstract

A novel protein monolayer modified electrode has been prepared by the self-assembly of metallothionein (MT) at a gold disk electrode. The properties of MT in Tris-HCl buffer and in the monolayer are studied by using cyclic voltammetry and differential pulse voltammetry with a gold disk electrode. In the negative sweep, the voltammogram of MT in buffer shows two small peaks and different electrochemical behaviour from that at a mercury electrode. Cd2+ complexed to the thionein can easily be replaced by Hg2+ ions, and Hg2+ ions can firmly adsorb in the MT monolayer with a saturation coverage of(2.78 +/- 0.29) x 10(-10) mol cm(-2) This behaviour has been used to preconcentrate trace Hg2+ for its determination by cathodic stripping differential pulse voltammetry. The cathodic stripping peak current is proportional to Hg2+ concentration in the range of 0.15-3 mu M and the detection limit isca. 0.08 mu M (16 ppb) with a 2 min open circuit accumulation step. The relative standard deviation is 7.2% at 0.4 mu M Hg2+ concentration (n = 4). At higher concentration the adsorption of Hg2+ exhibits a response similar to that expected for a Langmuir adsorption isotherm with the stability constant of (4.0 +/- 0.2) x 10(5) M-1. (C) 2000 Elsevier Science S.A. All rightsreserved.

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Documento generato il 30/11/20 alle ore 07:01:50