Abstract
We have considered the possibility of the sorption-spectrometric determination of molybdenum(VI) with phenylfluorone and chromium(VI) with diphenylcarbazide from a single sample by consecutive sorption from different media onto fiber materials filled with an AV-17 anion exchanger. The dependences of analytical signals of molybdenum and chromium on the sorption conditions (pH of the initial solution, NaCl concentration, sizes of the support disc, agitation time) have been studied in the batch mode. The conditions of analytical signal registration have been determined and the analytical ranges have been established (0.01–0.06 μg/mL for Cr and 0.02–0.2 μg/mL for Mo). It has been demonstrated that molybdenum and chromium can be determined at their ratios from 1: 1 to 5: 1 from a single sample after chromium sorption from 0.1 M HCl and molybdenum sorption at pH 4 by diffuse-reflection spectroscopy or visual test. The selectivity of molybdenum and chromium determination in the presence of interfering ions has been studied.
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Original Russian Text © V.P. Dedkova, O.P. Shvoeva, S.B. Savvin, 2013, published in Zhurnal Analiticheskoi Khimii, 2013, Vol. 68, No. 7, pp. 640–645.
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Dedkova, V.P., Shvoeva, O.P. & Savvin, S.B. Consecutive sorption of molybdenum(VI) and chromium(VI) from a single sample onto fiber materials filled with an anion exchanger and their solid-phase determination with phenylfluorone and diphenylcarbazide. J Anal Chem 68, 577–582 (2013). https://doi.org/10.1134/S1061934813050067
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DOI: https://doi.org/10.1134/S1061934813050067