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Flow injection study of the potentiometric lithium selectivity of cyclic dioxadiamides containing oxygen and nitrogen atoms

Fließinjektionsuntersuchung der potentiometrischen Lithium-Selektivität von cyclischen Dioxadiamiden, die Sauerstoff- und Stickstoff-Atome enthalten

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  • Ion-selective Electrodes
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Summary

Four 15-membered ring cyclic compounds with two oxygen and two nitrogen atoms incorporated in the ring were prepared and evaluated as neutral carriers in lithium ion-selective electrodes. These ionophores, along with potassium tetrakis (p-chlorophenyl)borate and o-nitrophenyloctyl ether (NPOE), were included in the PVC matrix that coated the tip of a silver-wire electrode. The potentiometric selectivities of the electrodes towards lithium over sodium, potassium, calcium and magnesium were determined. Selectivity coefficients, K potLi, Na ., as low as 9.5×10−3 were obtained and smaller coefficients for other metals, K potLi, M ., were found. A calibration curve for lithium in the presence of 140 mmol/l sodium, with a linear portion having a slope of 51 mV/decade, was obtained. The effect of incorporating 1% trioctylphosphine oxide (TOPO) in the electrodes was studied. Comparison with the results obtained with 15-crown-4-ethers is made.

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Authors and Affiliations

  1. Department of Chemistry, Yarmouk University, Irbid, Jordan

    A. S. Attiyat

  2. Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt

    Y. A. Ibrahim

  3. Department of Chemistry, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt

    A. M. Kadry

  4. Department of Chemistry, University of Washington, BG-10, 98195, Seattle, WA, USA

    R. Y. Xie & G. D. Christian

Authors
  1. A. S. Attiyat
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  2. Y. A. Ibrahim
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  3. A. M. Kadry
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  4. R. Y. Xie
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  5. G. D. Christian
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Attiyat, A.S., Ibrahim, Y.A., Kadry, A.M. et al. Flow injection study of the potentiometric lithium selectivity of cyclic dioxadiamides containing oxygen and nitrogen atoms. Z. Anal. Chem. 329, 12–17 (1987). https://doi.org/10.1007/BF00487533

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  • DOI: https://doi.org/10.1007/BF00487533

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