Girish Kumar,K; Pearl,Augustine; Sareena, John; Beena,Saraswathyamma(Department of Applied Chemistry, June 12, 2006)
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Abstract:
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.