FABRICATION AND CHARACTERIZATION OF A CD²⁺ ION SELECTIVE ELECTRODE OF THE COATED WIRE BASED ON POLYVINYL CHLORIDE

Tentriati Cahaya (Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Mulawarman, Samarinda, Kalimantan Timur, Indonesia)
Aman Sentosa Panggabean (Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Mulawarman, Samarinda, Kalimantan Timur, Indonesia)
Moh. Syaiful Arif (Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Mulawarman, Samarinda, Kalimantan Timur, Indonesia)

JURNAL ATOMIK
Vol 11 No 1 (2026)

This study reports the fabrication and characterization of a Cd²⁺ ion-selective electrode of the coated wire (ISE) based on PVC with sodium sulfide as the ionophore. The electrode was prepared using the optimum composition of Na₂S:PVC:DOP (0.7 g:0.2 g:0.1 mL) and doped in Cd(CH₃COOH)₂ solution. The results showed a Nernstian slope of 9.5 mV/decade, detection limit of 1×10⁻⁵ M, optimum pH range of 6–7, response time of 20–60 s, and a lifetime of 3 days. FT-IR analysis demonstrated successful electrode characterization via the formation of Cd–S interactions, indicated by the band at 612.75 cm⁻¹. The electrode exhibited good selectivity toward Cd²⁺ over interfering ions (Zn²⁺, Cu²⁺, NO₃⁻, Cl⁻, SO₄²⁻).