Use of haematoxylin in an improved method for the determination of ultramicro amounts of aluminium

Simple and sensitive methods for the determination of ultramicro amounts of Al with haematoxylin and its oxidised form in the presence of cetyltrimethylammonium bromide are described. The complexes formed obeyed Beer's law in the ranges 15-175 and 25-250 mu g exp --1 using haematoxylin and oxid...

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Bibliographic Details
Published in:Analyst (London) 1988, Vol.113 (4), p.577-580
Main Authors: ZAKI, M. T. M, EL-DIDAMONY, A. M
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Spectrometric and optical methods
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Summary:Simple and sensitive methods for the determination of ultramicro amounts of Al with haematoxylin and its oxidised form in the presence of cetyltrimethylammonium bromide are described. The complexes formed obeyed Beer's law in the ranges 15-175 and 25-250 mu g exp --1 using haematoxylin and oxidised haematoxylin, respectively. The best results for chelate formation were obtained at pH 7.6 and 7.0 with molar absorptivities of 1.7 x 10 exp 5 and 1.1 x 10 exp 5 mol exp --1 cm exp --1 , respectively. The values of Sandell's sensitivity were 0.0002 and 0.0003 mu g cm exp --2 , respectively. The effect of 25 interfering ions was studied. The method has been applied to the determination of Al in Fe and steel. 30 ref.--AA
ISSN:0003-2654
1364-5528
DOI:10.1039/AN9881300577