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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
Mohammed Jamaluddin Ahmed (1,*) , Faisal Hossain (2) , Esham Mahmood (3)
(1) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong-4331, Bangladesh
(2) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong-4331, Bangladesh
(3) Laboratory of Analytical Chemistry, Department of Chemistry, University of Chittagong, Chittagong-4331, Bangladesh
(*) Corresponding Author
Received: 03 Apr 2020 | Revised: 07 May 2020 | Accepted: 10 May 2020 | Published: 30 Jun 2020 | Issue Date: June 2020
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.
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The National Centre of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, Pakistan.
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DOI Link: https://doi.org/10.5155/eurjchem.11.2.160-167.1987
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