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Determination of ultra trace amount manganese (II) with kinetic spectrophotometric method

G.Haghdoost, F.Ahmadi, G.Shafiee,, A.Taleb Beydokhti, S.Karamipour

A new kinetic spectrophotometic method for the determination of trace amount manganese (II) in Tea real samples has been described based on it’s the catalytic effect on the oxidations of bariumdiphenylaminesulfonate by potassium bromate in sulfurique acid. The reaction is followed spectrophotometrically by measuring the decrease in the absorbance at 547.5 nm. Under the optimum conditions of 0.2 mol l-1 sulfurique acid, 10-4 mol l-1 bariumdiphanylaminesulfonate, 0.011 mol l-1 potassiumbromate at 35oC, calibration graph in the rang of 0.001-0.06g l-1 manganese (II).Concentrationwas obtained with detection limit of 0.2303 gml-1 by the fixed-time method of 3.5 min. The relative standard deviation for 0.05 g l-1 manganese (II) is%0.9. No serious interference was identified.The applicability of the method was demonstrated by the determination of the manganese (II) in real samples.