Spectrophotometric determination of Mercury(II) ions in laboratory and Zamzam water using bis Schiff base ligand based on 1,2,4-Triazole-3,5-diamine and o-Vaniline

The current study presents the development of a simple and direct spectrophotometric approach for Hg(II) ions determination. This method has the significant advantage of being a sim-ple procedure where no further solvent purification or pre-concentration is needed. The concentra-tion of Hg(II) ions was determined in the presence of the Schiff base ligand named 2-((5-(2-hydroxy-3-methoxybenzylideneamino)-2H-1,2,4-triazole-3-ylimino)methyl)-6-methoxyphenol (HMBT), at pH 10 using Briton Robinson Buffer. The method Obey Beer's law in concentration range 0.1-6 mg mL-1 of Hg with (LOD) 0 0.016 mg L-1 and (LOQ) 0.051 mg/L. The molar ratio ensured the formation of a metal complex between HMBT and Hg ions was in the molar ratio 2:1 (HMBT: Hg2+). The method was used for the determination of mercury ions in tap water and Zamzam water samples. The applied method has many advantages, such as simplicity, low cost, ease of oper-ation, rapid detection, low-ligand consumption, and high sensitivity. The analytical method sensi-tivity was confirmed via the suitable selection of experimental circumstances. More information about the structure and stoichiometry of the complex formed in solution between Hg(II) and HMBT ligand has been gained through the isolation and investigation of solid complex (HMBT-Hg). The structure of the solid complex, HMBT-Hg, has been elucidated by applying analytical routes such as elemental analysis , the spectral mass, UV-vis spectra , thermal analysis. (c) 2022 The Author(s). Published by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This study presents a simple and direct spectrophotometric method for determining Hg(II) ions, which eliminates the need for additional solvent purification or pre-concentration. The method can accurately and sensitively detect mercury ions in tap water and Zamzam water samples under specific experimental conditions.