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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 6
BKCSDE 26(6)
June 20, 2005 

Development of a New Copper(II) Ion-selective Poly(vinyl chloride) Membrane Electrode Based on 2-Mercaptobenzoxazole
Morteza Akhond*, Mehrorang Ghaedi, Javad Tashkhourian
Copper(II) ion-selective electrode, Ion sensor, PVC membrane, Potentiometry, 2-Mercaptobenzoxazole
Copper(II) ion-selective PVC membrane electrode based on 2-mercaptobenzoxazole as a new ionophore and o-nitrophenyl octyl ether (o-NPOE) as plasticizer is proposed. This electrode revealed good selectivity for Cu2+ over a wide variety of other metal ions. Effects of experimental parameters such as membrane composition, nature and amount of plasticizer, and concentration of internal solution on the potential response of Cu2+ sensor were investigated. The electrode exhibits good response for Cu2+ in a wide linear range of 5.0 × 10-6-1.6 × 10-2 mol/L with a slope of 29.2 ± 2.0 mV/decade. The response time of the sensor is less than 10 s, and the detection limit is 2.0 × 10-6 mol/L. The electrode response was stable in pH range of 4-6. The lifetime of the electrode was about 2 months. The electrode revealed comparatively good selectivities with respect to many alkali, alkaline earth, and transition metal ions.
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