الخلاصة

1-(2- Pyridyl azo)-4-Benzene naphthol(PABN) used as Spectrophotometric reagent for determination micro amount of Magnesium(II) in different Environmental and Vital samples, after conversion magnesium cation to anion complex by reaction with oxine, the study show 0.5M NaOH need to prepare oxine anion with concentration of 0.8M,initialy the organic reagent(PABN) must be react with Nickel(II) to form large cation complex produce ion pair complex with Mg(ox)3- have maximum absorbance at λ=398nm, the study also include organic solvent effect, thermodynamic, stoichiometry, as well micro amount determination of Magnesium(II) in different samples