Voltammetric Detection of Traces of Copper Using a Carbon Paste Electrode Modified With Tetraphenylporphyrin

Abstract

The voltammetric detection of copper(II) was carried out at a carbon paste electrode (CPE) modified with tetraphenylporphyrin (TPP). The analysis procedure consisted of an open circuit preconcentration step in stirred sample solution. This was followed by medium exchange to a pure electrolyte solution (Britton-Robinson buffer pH ¼ 6) where the accumulated copper(II) was reduced at À0.8 V vs. Hg/Hg 2 SO 4 and subsequently an anodic potential scan was effect to obtain the voltammetric peak. The parameters and conditions such as pH of the analyte solution and supporting electrolyte, preconcentration time, CPE composition, its activation and regeneration, and others, were studied in detail. The detection limit of the proposed procedure was found to be 2.0 Â 10 À9 mol l À1 of 369 ORDER REPRINTS Cu(II) in the analyte solution for a preconcentration time of 12 min. Applying suitable preconcentration times, a linear calibration graph from 9.0 Â 10 À8 to 5.0 Â 10 À5 mol l À1 of Cu(II) was established. Multiple determinations (n ¼ 8), following a preconcentration-measurement-regeneration cycle, gave a relative standard deviation of 4.5% at Cu(II) concentration of 1.0 Â 10 À7 mol l À1 . The proposed method was applied to the determination of Cu(II) in a real sample of residue solution after extraction and a mineral sample of Jinchuan Corporation.

Anodic Stripping Voltammetry of Heavy Metals at Nanocrystalline Boron‐Doped Diamond Electrode

“…Nowadays it is highly recommended not to use mercury and to choose other kinds of electrodes whose toxicity is low or nil. Carbon electrodes were then used like graphite [8 -9], glassy carbon [10 -13], carbon paste electrodes [14] and screen printed carbon electrodes SPCE [15] and their efficiency has been demonstrated for anodic stripping analysis.…”

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).…”

Pulse anodic stripping voltammetric determination of copper with an amoxicillin–nafion modified glassy carbon electrode

“…Many substances, such as Alga, N-phenylcinnamohydroxamix acid, N-acetyl-1-cysteine, 10-phenan-throline, Cysteine, Natural ionic polysaccharides, Sphagnum peat moss, 1,2-bis-methyl (2-aminocyclopentene-carbodithioate) ethane, Salicylideneamino-2-thiophenol, Diquinolyl-8,8 0 -disulfide, polypyrrole pyrocatechol violet, N-(2-hydroxybenzyl) chitosan, p-tertButylthiacalix(4)arene, Calix(4)arene, Hexacyanoferrate, 2-aminothiazole organofunctionalized silica, Tetraethyl thiuram disulfide and Tetraphenylporphyrin have been used to fabricate CME for the determination of copper [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”