A new PVC membrane electrode for manganese(II) ion based on a recently synthesized Schiff base of 5-[(4-nitrophenylazo)-N-hexylamine]salicylaldimine is reported. The electrode exhibits a Nernstian response for Mn(2+) ions over a wide concentration range (4.0x10(-7) to 1.8x10(-2)molL(-1)) with a slope of 30.1 (+/-1.0). The limit of detection is 1.0x10(-7)molL(-1). The electrode has a fast response time ( approximately 10s), a satisfactory reproducibility and relatively long life time. The proposed sensor revealed good selectivities over a wide variety of other cations include hard and soft metals. This electrode could be used in a pH range of 4.5-7.5. It was used as an indicator electrode in potentiometric titration of manganese(II) ions with EDTA solution.
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