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A simple and effective zeolite modified electrode (ZME) was constructed from Cu(II)-exchanged clinoptilolite nanoparticles (Cu(II)-CNP). The modifier was characterized by FTIR, BET, XRD and TEM techniques. The modified carbon paste electrode (Cu(II)-CNP/CPE) was used for the voltammetric determination of metronidazole (MNZ). The best voltammetric response was obtained by the electrode containing 20% of the modifier in NaCl 0.4 mol L−1 at pH 6. The electrode showed a linear response in the concentration range of 2.0 × 10−8 to 1.6 × 10−6 mol L−1 MNZ with a detection limit of 4.1 × 10−9 mol L−1 from square wave voltammetry. The electrode showed good repeatability, reproducibility, and a long lifetime based on statistical tests. The electrode also has good selectivity and good applicability in the determination of MNZ in some pharmaceutical samples.

A zeolite modified carbon paste electrode based on copper exchanged clinoptilolite nanoparticles for voltammetric determination of metronidazole