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Global Journal of Analytical Chemistry. Volume 2, Issue 4 (2011) pp. 187-197
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Research Article
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Spectrophotometric determination of trace Mn(II), Fe(II), Co(II), Ni(II) and Cu(II) in rice grains based on
2-(2,4-dihydroxyphen-1-ylazo)-thiazole
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Abdalla M. Khedra,*, Raafat M. Issaa, Maged A. El-Kamryb, Redda B. Hasna
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a Chemistry Department, Faculty of Science, Tanta University, Tanta, Egypt
b Chemistry Department, Faculty of Science, Kafr-Elshikh University, Kafr-Elshikh, Egypt
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Abstract |
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The
electronic absorption spectra of 2-(2,4-dihydroxyphen-1-ylazo)-thiazole (H2L) in organic solvents of different
polarities and aqueous buffer solutions of varying pH values were investigated
and discussed in relation to the molecular structure. The potentiality of H2L
as new chromogenic reagent for the spectrophotometric
determination of Mn(II), Fe(II), Co(II), Ni(II) and Cu(II) was studied by
extensive investigation of the optimum conditions favouring
the formation of the colored complexes. Beer's law is obeyed up to 3.30,
2.79, 4.13, 5.28 and 5.05 mg mL-1 for Mn(II),
Fe(II), Co(II), Ni(II) and Cu(II) respectively. The standard deviations of the
proposed method are 0.0003, 0.0007, 0.0008, 0.0005 and 0.0005. The molar absorptivities are 1.75 x 104, 1.96 x 104,
2.83 x 104, 2.73 x 104 and 2.28 x 104 l. mol-1
cm-1, whereas the Sandell
sensitivities are found to be 0.0031, 0.0029, 0.0021, 0.0022 and 0.0028 mg
cm-2. The effect of interfering ions on the determination of Mn(II),
Fe(II), Co(II), Ni(II) and Cu(II) was investigated. The proposed method was
applied to determination of the mentioned metal ions in rice grains with high
precession and good accuracy. The solid complexes were prepared and
characterized by using various physico-chemical
methods viz. elemental analysis, molar conductance, IR, UV-Visible, ESR,
mass spectra and magnetic susceptibility. All the obtained data reveal the
formation of the metal complexes through the donor sites of one N-atom of the
azo group and O-atom of the hydroxyl group in o-position.
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Keywords |
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Mn(II); Fe(II); Co(II); Ni(II) and Cu(II) determination; Rice grains
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