Determination of ultra-trace concentrations of tin by adsorptive cathodic stripping voltammetry on a glassy carbon mercury film electrode

Samuel B.O. Adeloju, Fleurdelis Pablo

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A sensitive and selective method is described for the determination of ultra-trace concentrations of tin by adsorptive cathodic stripping voltammetry on a glassy carbon mercury film electrode. The method involves a cotrolled preconcentration by accumulation of tin-catechol complexes on the electrode followed by stripping voltammetric measurement in the cathodic direction. The optimum conditions for the determination of tin by this method include the use of a rotated electrode at 1920 rpm, 0.10 M acetate buffer electrolyte (pH 2.4-4.7), 5 × 10-4 M ctechol and an accumulation potential of -0.20 V vs. Ag/AgCl. A linear concentration range is obtained from 0 to 35 μg 1-1 and the limit of detection is 0.5 μg 1-1 for an accumulation period of 300 s. An interference study with various metal ions indicated that these substances generally do not interfere with the tin determination, except for Cu, Cd and Cr. the interference of Cu and Cd is eliminated by the addition of 1 × 10-6 M EDTA into the solution. The interference of surface-active organic substances, e.g., Triton X-100, is overcome by UV irradiation of the sample for at least 2 h. The method was successfully employed for the determiation of tin in fruit juices. Comparison of the results obtained for the juices demonstrated reasonable agreement with those obtained by atomic adsorption spectrometry.

Original languageEnglish
Pages (from-to)143-152
Number of pages10
JournalAnalytica Chimica Acta
Volume270
Issue number1
DOIs
Publication statusPublished - 15 Dec 1992

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Tin
Glassy carbon
Voltammetry
Mercury
tin
Electrodes
electrode
Carbon
carbon
Fruit juices
Octoxynol
EDTA
Edetic Acid
electrolyte
Spectrometry
Electrolytes
Adsorption
Metal ions
spectrometry
Limit of Detection

Cite this

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abstract = "A sensitive and selective method is described for the determination of ultra-trace concentrations of tin by adsorptive cathodic stripping voltammetry on a glassy carbon mercury film electrode. The method involves a cotrolled preconcentration by accumulation of tin-catechol complexes on the electrode followed by stripping voltammetric measurement in the cathodic direction. The optimum conditions for the determination of tin by this method include the use of a rotated electrode at 1920 rpm, 0.10 M acetate buffer electrolyte (pH 2.4-4.7), 5 × 10-4 M ctechol and an accumulation potential of -0.20 V vs. Ag/AgCl. A linear concentration range is obtained from 0 to 35 μg 1-1 and the limit of detection is 0.5 μg 1-1 for an accumulation period of 300 s. An interference study with various metal ions indicated that these substances generally do not interfere with the tin determination, except for Cu, Cd and Cr. the interference of Cu and Cd is eliminated by the addition of 1 × 10-6 M EDTA into the solution. The interference of surface-active organic substances, e.g., Triton X-100, is overcome by UV irradiation of the sample for at least 2 h. The method was successfully employed for the determiation of tin in fruit juices. Comparison of the results obtained for the juices demonstrated reasonable agreement with those obtained by atomic adsorption spectrometry.",
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Determination of ultra-trace concentrations of tin by adsorptive cathodic stripping voltammetry on a glassy carbon mercury film electrode. / Adeloju, Samuel B.O.; Pablo, Fleurdelis.

In: Analytica Chimica Acta, Vol. 270, No. 1, 15.12.1992, p. 143-152.

Research output: Contribution to journalArticle

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AB - A sensitive and selective method is described for the determination of ultra-trace concentrations of tin by adsorptive cathodic stripping voltammetry on a glassy carbon mercury film electrode. The method involves a cotrolled preconcentration by accumulation of tin-catechol complexes on the electrode followed by stripping voltammetric measurement in the cathodic direction. The optimum conditions for the determination of tin by this method include the use of a rotated electrode at 1920 rpm, 0.10 M acetate buffer electrolyte (pH 2.4-4.7), 5 × 10-4 M ctechol and an accumulation potential of -0.20 V vs. Ag/AgCl. A linear concentration range is obtained from 0 to 35 μg 1-1 and the limit of detection is 0.5 μg 1-1 for an accumulation period of 300 s. An interference study with various metal ions indicated that these substances generally do not interfere with the tin determination, except for Cu, Cd and Cr. the interference of Cu and Cd is eliminated by the addition of 1 × 10-6 M EDTA into the solution. The interference of surface-active organic substances, e.g., Triton X-100, is overcome by UV irradiation of the sample for at least 2 h. The method was successfully employed for the determiation of tin in fruit juices. Comparison of the results obtained for the juices demonstrated reasonable agreement with those obtained by atomic adsorption spectrometry.

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