Cadmium(II) ion selective sensors have been fabricated from poly(vinyl chloride) (PVC) matrix membranes containing neutral carrier, monoaza-18-crown-6, sodium tetraphenyl borate (NaTPB) as an anion excluder and dibutylphthalate (DBP) and dioctylphthalate (DOP) as plasticizing solvent mediators. The membrane having the composition crown:NaTPB:PVC:DOP in the ratio 1:1:10:10 exhibits best results with linear potential response in the concentration range 1.0×10–5–1.0×10–1 M with a detection limit of 1.12 mg/L and a Nernstian slope of 29.0 mV/decade between pH 5.0–7.7. The sensor exhibits a fast response time of<10 s, is inert towards acids, salt solutions and nonaqueous media (upto 35% (v/v)) and was used over a period of 3 months with good reproducibility. It is selective over a number of mono-, bi-, and trivalent cations. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Cd2+ with EDTA and also for the determination of Cd2+ in waste water.
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Gupta et al. (2000) studied this question.
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