Abstract
A new PVC membrane ion selective electrode which is highly selective towards Ni(II) ions was constructed using a Schiff base containing a binaphthyl moiety as the ionophore. The sensor exhibited a good Nernstian response for nickel ions over the concentration range 1.0 × 10–1–5.0 × 10–6 M with a lower limit of detection of 1.3 × 10–6 M. It has a fast response time and can be used for a period of 4 months with a good reproducibility. The sensor is suitable for use in aqueous solutions in a wide pH range of 3.6–7.4 and works satisfactorily in the presence of 25% (v/v) methanol or ethanol. The sensor shows high selectivity to nickel ions over a wide variety of cations. It has been successfully used as an indicator electrode in the potentiometric titration of nickel ions against EDTA and also for the direct determination of nickel content in real samples: effluent samples, chocolates and hydrogenated oils.
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Kumar, K.G., Poduval, R., Augustine, P. et al. A PVC Plasticized Sensor for Ni(II) Ion Based on a Simple Ethylenediamine Derivative. ANAL. SCI. 22, 1333–1337 (2006). https://doi.org/10.2116/analsci.22.1333
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DOI: https://doi.org/10.2116/analsci.22.1333