“Preparation of a New Selective PVC Membrane Electrode for Copper(II) Ion Based on Complex of 1,3-Diphenyl-5- (P-Nitrophenyl) Formazan As Ionophore With Copper(II)”. Latakia University Journal -Basic Sciences Series 37, no. 1 (May 18, 2016). Accessed November 4, 2026. https://journal.latakia-univ.edu.sy/index.php/bassnc/article/view/1497.