Selective Membrane Electrode for Bromide Ion Based on Aza Pyrilium Ion Derivative as a new Ionophore.

Abstract

A highly selective electrode for Bromide ion based on aza pyrilium derivative as an excellent<br />ionophore is described.The sensor exhibits a good linear response with a slope of ( 60±1 ) mV per decade<br />over the concentration range of ( 1×10-3 – 9×10-6 M ) , and a detection limit of ( 3×10-6 M ) of Bromide<br />ions .The electrode response is independent of pH in the range of(4.0 –9.5).Selectivity coefficients<br />determined by the matched potential method ( MPM ) . Indicate that the interference from inorganic and<br />organic anions is negligible. The proposed sensor shows a fast response time of approximately (20 s).It<br />has been used as an indicator electrode in titration of Bromide with Ag +.