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Title: Atomic absorption spectrometric determination of trace manganese after separation and preconcentration with 1-(2-pyridylazo )-2-naphthol-naphthalene adsorbent
Authors: Taher, Mohammad Ali
Issue Date: Jun-2004
Publisher: NISCAIR-CSIR, India
IPC Code: G 01 J 3/42
Abstract: An atomic absorption spectrometric method for the determination of trace amounts of manganese after adsorption of its 1-(2- pyridylazo)-2-naphthol complex on microcrystalline naphthalene has been developed. This complex is adsorbed on microcrystalline naphthalene in the pH range 8.9-10.2 from large volumes of aqueous solutions of various alloys and biological samples. After filtration, the solid mass consisting of the manganese complex and naphthalene is dissolved with 5 ml of dimethylformamide and the metal determined by flame atomic absorption spectrometry. Manganese can alternatively be quantitatively adsorbed on [1-(2-pyridylazo)-2-naphthol]-naphthalene adsorbent packed in a column and determined similarly. About 0.05 μ g of manganese can be concentrated in a column from 500 ml of aqueous sample where its concentration is as low as 0.1 ng ml-1 . Eight replicate determinations of 0.2 μg ml-1 of manganese gave a mean absorbance of 0.086 with a relative standard deviation of 1.6%. The sensitivity for 1 % absorption was 11ng ml-1. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the trace determination of manganese in various standard samples.
Page(s): 1249-1252
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(06) [June 2004]

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