Chemical amplification of the signal in ion-selective potentiometry: indirect determination of Al(III) and U(VI) by steady-state and flow-injection potentiometry using a copper ion-selective electrode

M. Neshkova, E. Pancheva, J. Fucsko, G. Nagy, E. Pungor

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6 Citations (Scopus)

Abstract

The possibilities for the indirect steady-state and flow-injection determination of Al(III) and U(VI) with a copper ion-selective electrode wee studied. The method is based on the replacement reaction between the determinand and a CuL2-buffer system [L=oxalate (Ox) or malonate (Mal)] at a pH of 5.4 fixed with acetate buffer. Chemical amplification of the potentiometric signal was observed owing to the stoichiometry of the following overall replacement reaction:. 2CuL2 + M = ML2 + 2CuL. It is manifested by a double-Nernstian slope of the Cu(II) electrode function (60 mV per decade). The concentration range for Al determinations is from 1.25 to 216 mg l-1 and for uranium from 14 to 2142 mg l-1. Good reproducibility and high precision were achieved. Metal ions that do not form carboxylate complexes or form less stable complexes than CuOx2 (e.g., Ca, Sr, Ba, CD, Zn) do not interfere. Special masking procedures allowing the determination of Al(III) in the presence of Fe(III) and U(VI) in the presence of Th(IV) were developed and experimentally tested. A flow-injection version of this approach was elaborated which preserves the main beneficial features of the steady-state mode. The proposed approach could be extended to other indirect determinations, and seems very promising for future wider application of ion-selective electrodes as detectors in flow systems.

Original languageEnglish
Pages (from-to)149-157
Number of pages9
JournalAnalytica Chimica Acta
Volume259
Issue number1
DOIs
Publication statusPublished - Apr 5 1992

Fingerprint

Potentiometry
Ion-Selective Electrodes
steady flow
Amplification
Copper
amplification
Buffers
electrode
Ions
copper
Injections
Uranium
Oxalates
ion
replacement
Stoichiometry
Metal ions
Electrodes
Acetates
Metals

Keywords

  • Aluminium
  • Amplfication
  • Flow system
  • Ion-selective electrodes
  • Potentiometry
  • Uranium

ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Chemistry
  • Biochemistry
  • Spectroscopy

Cite this

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title = "Chemical amplification of the signal in ion-selective potentiometry: indirect determination of Al(III) and U(VI) by steady-state and flow-injection potentiometry using a copper ion-selective electrode",
abstract = "The possibilities for the indirect steady-state and flow-injection determination of Al(III) and U(VI) with a copper ion-selective electrode wee studied. The method is based on the replacement reaction between the determinand and a CuL2-buffer system [L=oxalate (Ox) or malonate (Mal)] at a pH of 5.4 fixed with acetate buffer. Chemical amplification of the potentiometric signal was observed owing to the stoichiometry of the following overall replacement reaction:. 2CuL2 + M = ML2 + 2CuL. It is manifested by a double-Nernstian slope of the Cu(II) electrode function (60 mV per decade). The concentration range for Al determinations is from 1.25 to 216 mg l-1 and for uranium from 14 to 2142 mg l-1. Good reproducibility and high precision were achieved. Metal ions that do not form carboxylate complexes or form less stable complexes than CuOx2 (e.g., Ca, Sr, Ba, CD, Zn) do not interfere. Special masking procedures allowing the determination of Al(III) in the presence of Fe(III) and U(VI) in the presence of Th(IV) were developed and experimentally tested. A flow-injection version of this approach was elaborated which preserves the main beneficial features of the steady-state mode. The proposed approach could be extended to other indirect determinations, and seems very promising for future wider application of ion-selective electrodes as detectors in flow systems.",
keywords = "Aluminium, Amplfication, Flow system, Ion-selective electrodes, Potentiometry, Uranium",
author = "M. Neshkova and E. Pancheva and J. Fucsko and G. Nagy and E. Pungor",
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T1 - Chemical amplification of the signal in ion-selective potentiometry

T2 - indirect determination of Al(III) and U(VI) by steady-state and flow-injection potentiometry using a copper ion-selective electrode

AU - Neshkova, M.

AU - Pancheva, E.

AU - Fucsko, J.

AU - Nagy, G.

AU - Pungor, E.

PY - 1992/4/5

Y1 - 1992/4/5

N2 - The possibilities for the indirect steady-state and flow-injection determination of Al(III) and U(VI) with a copper ion-selective electrode wee studied. The method is based on the replacement reaction between the determinand and a CuL2-buffer system [L=oxalate (Ox) or malonate (Mal)] at a pH of 5.4 fixed with acetate buffer. Chemical amplification of the potentiometric signal was observed owing to the stoichiometry of the following overall replacement reaction:. 2CuL2 + M = ML2 + 2CuL. It is manifested by a double-Nernstian slope of the Cu(II) electrode function (60 mV per decade). The concentration range for Al determinations is from 1.25 to 216 mg l-1 and for uranium from 14 to 2142 mg l-1. Good reproducibility and high precision were achieved. Metal ions that do not form carboxylate complexes or form less stable complexes than CuOx2 (e.g., Ca, Sr, Ba, CD, Zn) do not interfere. Special masking procedures allowing the determination of Al(III) in the presence of Fe(III) and U(VI) in the presence of Th(IV) were developed and experimentally tested. A flow-injection version of this approach was elaborated which preserves the main beneficial features of the steady-state mode. The proposed approach could be extended to other indirect determinations, and seems very promising for future wider application of ion-selective electrodes as detectors in flow systems.

AB - The possibilities for the indirect steady-state and flow-injection determination of Al(III) and U(VI) with a copper ion-selective electrode wee studied. The method is based on the replacement reaction between the determinand and a CuL2-buffer system [L=oxalate (Ox) or malonate (Mal)] at a pH of 5.4 fixed with acetate buffer. Chemical amplification of the potentiometric signal was observed owing to the stoichiometry of the following overall replacement reaction:. 2CuL2 + M = ML2 + 2CuL. It is manifested by a double-Nernstian slope of the Cu(II) electrode function (60 mV per decade). The concentration range for Al determinations is from 1.25 to 216 mg l-1 and for uranium from 14 to 2142 mg l-1. Good reproducibility and high precision were achieved. Metal ions that do not form carboxylate complexes or form less stable complexes than CuOx2 (e.g., Ca, Sr, Ba, CD, Zn) do not interfere. Special masking procedures allowing the determination of Al(III) in the presence of Fe(III) and U(VI) in the presence of Th(IV) were developed and experimentally tested. A flow-injection version of this approach was elaborated which preserves the main beneficial features of the steady-state mode. The proposed approach could be extended to other indirect determinations, and seems very promising for future wider application of ion-selective electrodes as detectors in flow systems.

KW - Aluminium

KW - Amplfication

KW - Flow system

KW - Ion-selective electrodes

KW - Potentiometry

KW - Uranium

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