Extraction and Spectrophotometric Determination of Mn(II) with N, N’’-bis (Ohydroxy-acetophenone) Ethylene Diimine Derivative as an Analytical Reagent

The spectrophotometric method is coupled with solvent extraction technique and used for the determination of Mn(II) using N, N’’-bis (O-hydroxy-acetophenone) ethylene diimine (HAPED) as an analytical reagent. This reagent is synthesised in the laboratory and characterised by NMR, IR, mass and elemental analysis for its purity. The reagent forms a light yellow -colored stable complex with manganese metal, which can be quantitatively extracted into chloroform at pH 5.2. This Mn (II)-HAPED complex in chloroform exhibit intense absorption peak at 370nm. Beer's law is obeyed in the range of 1–10 ppm of manganese solution giving linear and reproducible graph. The stoichiometric ratio of complex studied by Job's continuous variation method, mole ratio and slope ratio method. The molar absorptivity and Sandell's sensitivity are also calculated. The molar absorptivity is 1,730.77 L/mol/cm and Sandell sensitivity is 0.0318 μg/cm². The proposed method is rapid, sensitive, reproducible, accurate and has been satisfactory applied for determination and separation of Mn(II) in commercial mixtures, pharmaceutical samples and alloys.