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Thiocyanate Ion-selective PVC Membrane Electrode Based on N,N′-Ethylene-bis(4-methylsalicylidineiminato)nickel(II)

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Abstract

A highly selective poly(vinyl chloride) (PVC) membrane electrode based on an N,N′-ethylene-bis(4-methyl-salicylidineiminato)nickel(II) [Ni(EBMSI)] complex as a carrier for a thiocyanate-selective electrode is reported. The influences of the membrane composition, pH and possible interfering anions were investigated based on the response properties of the electrode. The electrode exhibited a good Nernstian slope of −58.9 ± 0.7 mV decade−1, over a wide pH range of 3.5–8.5 and a linear range of 1.0 × 10−6–1.0 × 10−1 M for thiocyanate. The detection limit of electrode was 3.1 × 10−7 M SCN–. The selectivity coefficients determined by a fixed interference method (FIM) indicate that a good discriminating ability towards the SCN− ion compared to other anions. The proposed sensor had a fast response time of about 5–15 s and could be used for at least 3 months without any considerable divergence in the potential. It was applied as an indicator electrode in the titration of thiocyanate with Ag+ and in the potentiometric determination of thiocyanate in saliva and urine samples.

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Authors and Affiliations

  1. Chemistry Department, Yazd University, Yazd, Iran

    M. Mazloum Ardakani

  2. Chemistry Department, Kashan University, Kashan, Iran

    M. Jamshidpour, H. Naeimi & L. Moradi

Authors
  1. M. Mazloum Ardakani
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  2. M. Jamshidpour
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  3. H. Naeimi
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  4. L. Moradi
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Correspondence to M. Mazloum Ardakani.

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Ardakani, M.M., Jamshidpour, M., Naeimi, H. et al. Thiocyanate Ion-selective PVC Membrane Electrode Based on N,N′-Ethylene-bis(4-methylsalicylidineiminato)nickel(II). ANAL. SCI. 22, 1221–1226 (2006). https://doi.org/10.2116/analsci.22.1221

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  • DOI: https://doi.org/10.2116/analsci.22.1221

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