Zn(II)-selective membrane electrode based on tetraazamacrocycle [Bzo2Me2Ph2(16)hexaeneN4]

A PVC membrane electrode using [Bzo(2)Me(2)Ph(2)(16)hexaeneN(4)] (I) as ionophore, oleic acid as lipophilic additive and o-nitrophenyloctyl ether as plasticizer has been investigated as Zn(II)-selective electrode. The membrane incorporating 34.9% (w/w) PVC, 2.3% I, 4.7% OA and 58.1% o-NPOE gave linear response over the concentration range 2.82 x 10(-6) - 1.0 X 10(-1) M with a Nernstian slope of 28.5 +/- 0.2 mV/decade of concentration with a detection limit of 2.24 x 10(-6) M (0.146 ppm) and showed a response time of less than 10 s and could be used in pH range 2.5-8.5. High selectivity was obtained over a wide variety of metal ions. The proposed electrode was successfully used as an indicator electrode in potentiometric titration of zinc ions with EDTA and for determination of zinc in real samples.