The Schiff bases have been synthesised by the reaction of Benzoinoxime primary ligand with heterocyclic compounds such as 2-aminothiazole (SL 1 ) and 8-hydroxyquinoline (SL 2 ) to form the secondary ligand, which than react with the metal halides to form complexes of Co (II) and Zn (II). The elemental analysis data shows that the metal to ligand ratio in all Co (II) simple is 1:2 for simple complexes and 1:2:2 for metal complex with oxime as a primary ligand and SL 1 as a secondary ligand while it is 1:2:1 for metal complex with oxime as a primary ligand and SL 3 as a secondary ligand whereas Zn (II) complexes of mixed ligand exhibit the stoichiometry 1:2:2. The structural features have been determined from IR, UV-Vis, and XRD data. All the complex shows a distorted octahedral geometry to mononuclear Co (II) complexes of mixed ligands, while square planner geometry to mononuclear Co (II) complexes of oximes. Zn (II) complexes of mixed ligands shows a distorted octahedral geometry, while square planner geometry to mononuclear Zn (II) complexes of oximes. All the synthesised compounds were screened for antimicrobial activity.

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The Lead - Ion Selective Electrode (Pb-ISE) and Chromium-Ion electrode (Cr-ISE) is a method for the analytical determination of Pb(II) and Cr(III) in natural matrices. The ISEs are very sensitive, selective, and inexpensive analytical tools that can be applied to determine Pb(II) and Cr(III) in soil samples due to relatively high limits of detection. In the present work, we examined the possibility of using solid contact ISEs in soil analysis, combined with a simplified extraction method based on dilute HNO3 that can be carried out at the field site. The Ionic strength of lead and Chromium is measured by using The Pb-ISE and Cr-ISE were fabricated and their characteristics were studied separately and the Ionic strength of Pb(II) and Cr(III) was measured by using them, the results were found to be quite satisfactory.