Determination of traces of copper by anodic stripping voltammetry after its preconcentration via an ion-exchange route at carbon paste electrodes modified with vermiculite

Ogorevc, Božidar; Cai, Xiaohua; Grabec, Irena

doi:10.1016/0003-2670(94)00504-f

Cited by 43 publications

(30 citation statements)

References 25 publications

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“…For instance, a detection limit of 8610 À10 mol dm À3 has been reported for CPEs modi®ed with di-8-quinolyl disul®de [27]. Similarly, detection of Cu 2 down to 5610 À9 mol dm À3 with ion-exchange at a vermiculite modi®ed CPE [28] and detection of Cu 2 down to 5610 À10 mol dm À3 at a CPE modi®ed with N-phenylcinnamohydroxamic acid [29] have been reported. In such examples, there is no background signal due to a conducting polymer ®lm nor a problem with the requirement to partition a cationic species into a partially cationic ®lm.…”

Section: à3mentioning

confidence: 95%

Polypyrrole Films Doped with an Electroactive Sulfonated Chelating Reagent: Electrochemical Characterization and the Detection of Metal Ions

Arrigan¹,

Lowens

1999

Electroanalysis

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Polypyrrole ®lms doped with the electroactive chelating reagent 3-(2-pyridyl)-5,6-diphenyl-4,4H -disulfonate-1,2,4-triazine (PDTDS 2À ) were prepared and characterized. The electroactive azo bond in PDTDS 2À was detected in the polymer ®lm by cyclic voltammetry. The ratio of pyrrole to PDTDS 2À in the ®lms (as evaluated from azo reduction and polymer growth charges) was 11.7 : 1 (s 2X03, n 38), quite close to the expected ratio of 8 : 1 for a doubly charged anion-doped ®lm. The azo bond electrochemistry in the polypyrrole exhibited Nernstian pH behavior (DE f aDpH 7 54.7 AE 1.3 mV dec À1 ). Copper detection by medium-exchange cyclic voltammetry at these ®lms was examined and it was found that both reduction and stripping, oxidation responses were obtained but the latter was better as it was narrower and larger in magnitude. Thinner ®lms gave better copper responses and detection of Cu 2 down to 1610 À6 mol dm À3 was possible at ®lms prepared with a growth charge of about 40 mC. Selectivity was evaluated in mixture experiments and a range of commonly occurring ions did not interfere in the Cu 2 electrochemical detection. The most severe interferents were mercury(II) and EDTA; new voltammetric peaks for Ag(I) and Hg(II) were observed.

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Section: à3mentioning

confidence: 95%

Polypyrrole Films Doped with an Electroactive Sulfonated Chelating Reagent: Electrochemical Characterization and the Detection of Metal Ions

Arrigan¹,

Lowens

1999

Electroanalysis

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“…Therefore the value of À0.40 V was chosen and used in all others studies. The accumulation time is another important parameter [28] which controls the sensitivity of the electrode and determines the duration of the analysis. The relationship between peak current and accumulation time in a solution containing 1610 À7 mol L…”

mentioning

confidence: 99%

Surface Complexation of Copper(II) with Alizarin Red S Adsorbed on a Graphite Electrode and Its Possible Application in Electroanalysis

et al. 1999

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Alizarin red S (ARS) has been used previously as a spectrophotometric reagent for several metals. It has been also employed as an electrode modi®er agent for voltammetric analysis. With the purpose of studying the electrochemistry of the adsorbed ARS ligand and the surface ARS-copper(II) complex, on the pyrolytic graphite electrode, cyclic voltammetric experiments were carried out in open and closed circuits. The results indicate that ARS is strongly and irreversibly adsorbed on the electrode surface. This adsorption process was employed to immobilize, by complexation, copper ions from the solution, and for a possible application of the ARS modi®ed electrode in trace copper electroanalysis are explored in this article. The optimization for trace copper determination in aqueous solution was accomplished by anodic stripping voltammetric technique (differential pulse mode); the preconcentration potential was 7 0.40 V; pH was 5.3 and accumulation time was 2 minutes. Under these conditions, the detection limit was 1.7610 78 mol L 71, and a linear range from 1.0610 77 to 4.0610 76 mol L 71.

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“…6,9,10 Carbon paste electrodes modified with functional ligands have been more widely used to pre-concentrate and quantify trace metal ions. [11][12][13][14][15][16][17] The pollution of cadmium is one of the most serious environmental problems because of our stability in contaminated site and complexity of mechanism in biological toxicity. Once absorbed, cadmium can be accumulated in the body and greatly threaten the health of human.…”

Section: Introductionmentioning

confidence: 99%

Using the organofunctionalised SBA-15 nanostructured silica as a carbon paste electrode modifier: determination of cadmium ions by differential anodic pulse stripping voltammetry

Cesarino¹,

Marino²,

Matos³

et al. 2007

J. Braz. Chem. Soc.

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Determination of traces of copper by anodic stripping voltammetry after its preconcentration via an ion-exchange route at carbon paste electrodes modified with vermiculite

Cited by 43 publications

References 25 publications

Polypyrrole Films Doped with an Electroactive Sulfonated Chelating Reagent: Electrochemical Characterization and the Detection of Metal Ions

Polypyrrole Films Doped with an Electroactive Sulfonated Chelating Reagent: Electrochemical Characterization and the Detection of Metal Ions

Surface Complexation of Copper(II) with Alizarin Red S Adsorbed on a Graphite Electrode and Its Possible Application in Electroanalysis

Using the organofunctionalised SBA-15 nanostructured silica as a carbon paste electrode modifier: determination of cadmium ions by differential anodic pulse stripping voltammetry

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