Novel ZrO2+ ion-selective electrode based on 4,7,13,16,21,24-hexa oxa-1,10- diazabicyclo [8,8,8]-hexa cosane as neutral carrier in PVC matrix. M. Aghaie, Dr. Karim Zare and M.Giahi. Journal of Physical & Theoretical Chemistry Islamic Azad University of Iran 3 (3) (2006). Science and Research Campus ISSN: 1735-2126