“…Recently, several studies concerning the selective and sensitive PVCmembrane ion-selective electrodes have been reported for some ions (Zamani, Abedini-Torghabeh, and Ganjali 2006a;Zamani, Rajabzadeh, Ganjali, and Nourozi 2007;Liu et al 2006;Zamani, Rajabzadeh, and Ganjali 2006a, 2007c, 2007dLuo, Chai, and Yuan 2007;Zamani, Ganjali, Norouzi, Adib, and Aceedy 2006;Zhang et al 2007;Zamani, 556 H. A. Zamani et al Ganjali, andAdib 2007a, 2007b;Zamani, Ganjali, Nourozi, and Meghdadi 2007;Behmadi et al 2007;Zamani, Ganjali, and Seifi 2007;Pooyamanesh et al 2007). The aim of this work is fabrication of a highly selective and sensitive praseodymium(III) PVC membrane electrode based on N 01 ,N 02 -bis(2-oxo-1,2-diphenylethylidene)ethanedihydrazide (BEH) as an excellent ionophore for the selective and sensitive potentiometric determination of Pr(III) ion over a wide concentration range (Fig.…”