The spectrophotometric determination of vanadium after extraction as vanadium(III) ferronate by tribenzylamine |
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Authors: | V. Yatirajam S.P. Arya |
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Affiliation: | Department of Chemistry, Kurukshetra University, Kurukshetra, 132119, Haryana India |
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Abstract: | Vanadium(III) obtained by dithionite reduction of vanadium(V) can be extracted as its ferron complex with tribenzylamine in chloroform from 0.05 M sulphuric acid. Vanadium (0–5 μg ml-1) is determined spectrophotometrically at 430 nm with a sensitivity of 0.0028 μg V cm-2. Al(III), Co(II), Ni(II), Fe(II, III), Hg(II), Si(IV), Be(II), Mg(II), Ca(II), Sr(II), Ba(II), Cr(VI, III), W(VI), Zn(II), U(VI), Mn(II). Pb(II), Cu(II), Cd(II) and Th(IV) do not interfere; only Mo(VI), Ti(IV), Zr(IV). Bi(V) and Sn(II) interfere. A single determination takes only 7 min. The extracted complex is VIII (R-3H.TBA)3 where R = C9H4O4NSI. The method is satisfactory for the determination of vanadium in steels, alum and other samples without preliminary separations. |
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