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A highly selective and simple spectrophotometric method for the determination of zinc at nano-trace levels in some environmental, biological, food, and pharmaceutical samples using 2-hydroxynaphthaldehydebenzoylhydrazone Ahmed, Mohammed Jamaluddin Hossain, Faisal Mahmood, Esham Selectivity Nano-trace level Zinc determination Spectrophotometry Environmental and biological samples 2-Hydroxynaphthaldehydebenzoylhydrazone A simple, ultra-sensitive, and highly selective spectrophotometric method has been established for the trace quantification of zinc (Zn), using 2-hydroxynaphthaldehyde benzoylhydrazone (HNABH). Zn forms a pale yellowish-green complex (maximum absorption at 426 nm) with HNABH (1:1, v:v) in a marginally acidic solution (0.00005-0.00023 M H2SO4). The average molar absorption coefficient and Sandell’s sensitivity were found: 2.87×105 L/mol.cm and 12 ng/cm2 of Zn, respectively. The observed linearity range for Zn was 0.01-50 mg/Lwith a detection limit of 1 µg/L. The analysis of biological, food, and vegetable samples using the suggested method were found to be in tremendous accord with those acquired by Atomic Absorption Spectroscopy (AAS) and Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES). The method has high precision and accuracy (s = ±0.01 for 0.5 mg/L). The limit of quantification of the proposed method was 10 µg/L. Atlanta Publishing House LLC 2020-06-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1987 10.5155/eurjchem.11.2.160-167.1987 European Journal of Chemistry; Vol. 11 No. 2 (2020): June 2020; 160-167 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1987/pdf_1987 Copyright (c) 2020 Authors