Potentiometric Based Membrane Sensor for Zinc Ion
نویسندگان
چکیده
A PVC-based membrane of 12-crown-4 exhibits good response for Zn2+ in a wide concentration range (7.08 10-5-1.00 10-1 M) with a non-nernstian slope of 20.5 mv per decade of concentration of Zn2+. The response time of sensor is <10 s and the membrane can be used for more than 3 months without observing any divergence. In addition, the proposed sensor exhibits very good selectivity for Zn2+ over other cations and can be used in a pH range (4.0-7.0). The membrane worked satisfactorily in non-aqueous medium up to 40% (v/v) non-aqueous content. The electrode has been used as an indicator electrode to determine the end point in the potentiometric titration of Zn2+ with EDTA.
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