LAUSR

Abstract A new electrochemical sensor for the selective detection of Cd2+ ion based on Schiff base, 1,1′-(biphenyl-4,4′-diylbis(azan-1-yl-1-ylidene))bis(methan-1-yl-1-ylidene) dinaphthalen-2-ol (BZNA) having from both moieties 2-hydroxy-1-iminomethylnaphthalene and benzidine core is presented. BZNA was synthesized by condensation reaction and then fully characterized. A thin film of BZNA was fabricated onto Nafion/Glassy carbon electrode (GCE) with 5.0% ethanolic solution of Nafion as the conducting coating agent. A slurry of BZNA was used to coat the GCE (GCE; 0.0316 cm2) as a thin layer for the selective detection of Cd2+ ion in an aqueous solution. A linear calibration curve that has a linear dynamic range (LDR) from 0.1 nM to ∼0.1 mM is obtained. From the slope of the plot, the calculated sensitivity, limit of detection (LOD), and limit of quantification (LOQ) of Cd2+ ion were found to be 2.93 µA µM−1 cm−2, 32.0 ± 1.62 pM, and 106.67 pM respectively. This novel approach might pave the way for the development of heavy metal ion detection process in the fields of environmental and healthcare.