selective membrane electrode for bromide ion based on aza pyrilium ion derivative as a new ionophore.

a highly selective electrode for bromide ion based on aza pyrilium derivative as an excellentionophore is described.the sensor exhibits a good linear response with a slope of ( 60±1 ) mv per decadeover the concentration range of ( 1×10-3 – 9×10-6 m ) , and a detection limit of ( 3×10-6 m ) of bromideions .the electrode response is independent of ph in the range of(4.0 –9.5).selectivity coefficientsdetermined by the matched potential method ( mpm ) . indicate that the interference from inorganic andorganic anions is negligible. the proposed sensor shows a fast response time of approximately (20 s).ithas been used as an indicator electrode in titration of bromide with ag +.