ELECTROCHEMICAL DETERMINATION OF COPPER(II) BY GOLD ELECTRODES MODIFIED WITHN-ACETYL-l-CYSTEINE

Differential Pulse Anodic Stripping Voltammetric Determination of Traces of Copper with a Tobramycin-Nafion Modified Electrode

“…[10][11][12] In recent years, various chemically modified electrodes have been used to determine copper. Many substances, such as alga, 10 N-phenylcinnamohydroxamix acid, 11 N-acetyl-1-cysteine, 12 10-phenan-throline, 13 cysteine, 14 natural ionic polysaccharides, 15 Sphagnum peat moss, 16 1,2-bis-methyl(2-aminocyclopentene-carbodithioate)ethane, 17 salicylidenea-mino-2-thiophenol, 18 diquinolyl-8,8′-disulfide, 19 polypyrrolepyrocatechol violet, 20 N-(2-hydroxybenzyl)chitosan 21 and tetraphenylporphyrin, 22 have been used to fabricate the CME for the determination of copper. However, most of these modifiers were used to produce chemically modified carbon paste electrodes (MCPE).…”

Electrochemical Determination of Cu(II) Ions by 4‐Formylphenylboronic Acid Modified Gold Electrode

“…Despite of this fact in our study better sensitivity towards Cu(II) ions was presented in comparison with many other modified electrodes, which were reported by some other researchers, e.g. : a 4-carboxyphenyl-grafted screen printed electrode treated by SWV offered the LOD as 5.0 10 À9 M [9]; penicillamine-SAM modified gold electrode treated by cyclic voltammetry exhibited the LOD as 4.0 10 À7 M [26]; gold electrode treated by stripping techniques showed the LOD as 1.0 10 À10 M [37]; cysteine-modified mercury film electrode treated by stripping potentiometry offered the LOD as 5.0 10 À10 M [38], cysteine-modified carbon nanotube electrode surfaces treated by differential pulse anodic stripping voltammetry offered the LOD as 15 ppb [39].…”

Determination of Copper in the Presence of Various Amounts of Arsenic with L‐Cysteine Modified Gold Electrodes

“…Similar difficulties occur when the deposition of the analyte is accompanied by a simultaneous electrode reaction of another substance. In terms of copper determination, the interferences most commonly recognized are Bi , Pb 2þ , Sb 3þ and Zn 2þ [9,10]. However, in some places such as Bangladesh, Inner Mongolia, Chile etc., large amounts of arsenic and copper are simultaneously present in natural water systems.…”

“…However, due to the toxicity of mercury, it is necessary to develop new electrodes without mercury for the determination of copper. Gold electrodes offer an attractive alternative and several studies have been reported on gold electrodes [8,10,11]. Chemically modified electrodes (CME) are an alternative.…”

“…Various chemically modified electrodes have been used to determine copper. These have been based on as N-acetyl-l-cysteine [10], 2-mercaptoethane sulfonate [8,11], or 10-phenanthroline [12].…”