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Direct spectrophotometric determination of manganese(II) with N,N’-Bis (2-amino-benzoyl) triethylenetetramine in aqueousmedium

Krishna Pillai Girish Kumar, Raghunathan Muthuselvi

Anew, simple, sensitive and rapid spectrophotometricmethod is proposed for the determination of trace amounts of manganese(II). The method is based on the reaction at pH 11.5 between the synthesized reagent, N,NÂ’- Bis (2–aminobenzoyl) triethylenetetramine (BABTT) and manganese (II) forming a brown coloured water soluble complex. The brown coloured Mn(II) – BABTT complex shows maximum absorbance at 400nm. At this wavelength, the complex shows large absorbance while the reagent blank shows negligent absorbance. Hence, the analytical study are carried out at 400nm at pH 11.5. BeerÂ’s law is valid over the concentration range 1.20- 16.86µgmL-1, withmolar absorptivity of 0.684x103Lmol-1cm–1. The tolerance limits for interfering ions are discussed.All variables were studied in order to optimize the reaction conditions. Though, a number of spectrophotometric methods have been reported for the determination of manganese, however, no reagent exhibits outstanding performance for direct spectrophotometric determination of manganese(II) in aqueous medium. The efficacy of the proposed method is shown by the successful determination of traces of manganese in its pure form, natural samples, alloys and industrial effluents.