Direct Spectrophotometric Method for Determination of Cadmium (II) Ions Using Bis-Thiosemicarbazone

A novel and simple study outlines the advancement of a straightforward and precise spectrophotometric technique for the determination of Cd (II) ions. This method offers a notable benefit as it is a straightforward procedure that does not require additional purification or concentration of the solvent. The concentration of Cd (II) ions was determined in the presence of bis(indoline-2, 3-dione) thiosemicarbazone (L) at a pH of 12 using Briton-Robinson Buffer. The concentration range for Cd (II) ions in the method follows Beer's law and is between (1.8-17.8) × 10^-5 mol L^-1. The limit of detection is 0.245 μg mL^-1(2.2 μmol L^-1) and the limit of quantification is 0.817 μg mL^-1 (7.3 μmol L^-1). The molar ratio between L and Cd (II) ions was 1:2, ensuring the development of a metal complex. The applied method offers numerous benefits, including its simplicity, affordability, convenience of use, quick detection, minimal use of ligands, and high sensitivity. The sensitivity of the analytical approach was verified by carefully selecting appropriate experimental conditions. Additional insights into the composition and arrangement of the complex produced in a solution containing Cd (II) ions and the ligand (L) have been obtained by isolating and studying the solid complex L-Cd. The solid complex, L-Cd, was determined using analytical methods including elemental analysis, UV-Vis spectra, spectral mass, and thermal analysis.