2025, Vol. 6, Issue 2, Part D
Fabrication of novel potentiometric sensor for highly selective determination of cobalt (II)
Author(s): Narendra Kumar and Neeraj Sharma
Abstract: A cobalt (II) ion-selective membrane electrode was developed using a poly (vinyl chloride) (PVC) matrix incorporating a newly synthesized Schiff base, 5-methyl-3-((5-bromosalicylidene) amino) pyrazole, as a neutral ionophore. Among the membrane formulations studied, the composition ionophore: NaTPB: PVC: NPOE= 2: 1.5: 65: 115 (mg) exhibited the most favourable analytical performance. The optimized sensor displayed a near-Nernstian response towards Co²⁺ ions across a broad concentration range, with a detection limit of 3.5 × 10⁻⁸ mol L⁻¹. The electrode demonstrated a rapid response time (< 20 s) and maintained stable potentiometric behaviour for approximately three months without significant drift in its characteristics. The proposed sensor exhibited excellent selectivity for Co²⁺ over a variety of potentially interfering ions. Reliable potentiometric performance was observed within the pH range 2.5-6.0, and the electrode tolerated up to 20% (v/v) of non-aqueous solvents in the measurement medium.
DOI: 10.22271/reschem.2025.v6.i2d.239
Pages: 287-294 | Views: 57 | Downloads: 23
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How to cite this article:
Narendra Kumar, Neeraj Sharma. Fabrication of novel potentiometric sensor for highly selective determination of cobalt (II). J Res Chem 2025;6(2):287-294. DOI: 10.22271/reschem.2025.v6.i2d.239
