Spectrophotometric determination of Mn (Vιι)‎ by using pyrazolon azo as an analytical reagent

الملخص EN

Anew and selective spectrophotometric method for the determination of trace amount of Mn (VΙΙ) in aqueous sample is reported.The interaction in solution between Mn(VΙΙ) and 4-[4′-antipyriyl)azo] -3- bromo phenol(APBP) was studied.

In the presence of (APBP)–Mn(VΙΙ) forms an intense color.

Soluble complex that is stable and has a maximum absorption at (564) nm, εmax of(0.126 x 104) L.mol cm-1 was studied.

A linear correlation (0.3-5) μg / ml was found between absorbance at λmax and concentration.

The stability constant was found to be (0.114 x 106 ) L.mol-1 .

The relative standard deviation, recovery and relative error values of method were found.

The effect of diverse ions on the determination of Mn(VΙΙ) to investigate the selectivity of method and masking agents effect on absorbance were also studied.