Synthesis, spectroscopic study of antipyryl azo 2-naphthol and use it as new reagent for determination of Co (II)‎ and Cu (II)‎

الملخص EN

A simple ,accurate and sensitive spectrophotometric method has been developed the determination of Cobalt(II) and Cupper (II) .The method is based on the chelation of Co(II) and Cu(II) ions with 4-(4´-pyrazolon azo) -2-Naphthol(APAN) in aqueous medium .

The complexes have a maximum absorption at (513) and (506) nm and μ max 0.531×10 4 and 0.12×10 5 L.mol -1.cm -1 for Co(II) and Cu(II) respectively .The reagent and two complexes have been prepared in ethanolic solution.

The stoichiometry of both complexes were found to be 1 : 2 (metal : legend) .The effects of various cations and anions on Co(II) and Cu(II) determination have been investigated .The stability constants and standard deviations for Co(II) and Cu(II) 0.291 x107, 0.909X108 L.mol -1 , (0.291) and (0.332) respectively .The optimum condition for full color development for described methods were applied satisfactorily to synthetic samples.