Summary
Vanadium(IV) and (V) can be quantitatively extracted with 0.2 mol/l Amberlite LA-2 in xylene at pH 3.0 from 0.02 mol/l malonic acid, stripped with 0.5 mol/l hydrochloric acid, and determined spectrophotometrically. Five other liquid anion exchangers (Amberlite LA-1, Primene JM-T, Aliquat 336S, TOA and TIOA) were examined as possible extractants. The extraction of vanadium(IV) was found to be quantitative only with Amberlite LA-2, while that of vanadium(V) was quantitative with Amberlite LA-1 and LA-2, Primene JM-T and Aliquat 336S. Eight common solvents were tested as diluents; of these hexane, cyclohexane, benzene, and xylene were found to be satisfactory. Vanadium was separated from elements that do not form anionic complexes with malonic acid by selective extraction, from those that form weak complexes by washing the organic extract with water, and from metals that form strong malonato complexes by selective stripping with hydrochloric, nitric, or sulphuric acid. The method has been applied to the determination of vanadium in steel, coal fly ash and fuel oil. The precision of measurement is within ±5% and the detection limit of the method for vanadium is 0.5 mg/kg.
Similar content being viewed by others
References
De AK, Khopkar SM, Chalmers RA (1970) Solvent extraction of metals. Van Nostrand Reinhold, London
Sekine T, Hasegawa Y (1977) Solvent extraction chemistry: fundamentals and applications. Marcel Dekker, New York
Stary J (1964) The solvent extraction of metal chelates. Pergamon, Oxford
Svehla G, Tölg G (1976) Talanta 23:755
Nakagawa G (1960) J Chem Soc Jpn 81:1536
Selmer-Olsen AR (1966) Acta Chem Scand 20:1621
Sato T, Ikoma S, Nakamura T (1977) J Inorg Nucl Chem 39:395
Kamiya S (1966) J Chem Soc Jpn 69:24
Rusheed A, Qazi AH, Suhail A, Ashraf M (1975) Sep Sci 10:507
Shete SD, Shinde VM (1981) Anal Chim Acta 125:165
Rao RR, Khopkar SM (1983) Anal Chem 55:2320
Dalvi MB, Khopkar SM (1979) Talanta 26:892
Rao RR, Khopkar SM (1983) Analyst 108:346
Rao RR, Khopkar SM (1984) Anal Lett 17(A6):523
Dalvi MB, Khopkar SM (1978) Talanta 25:599
Sawant MA, Khopkar SM (1980) Talanta 27:451
Sriramam K, Rao GG (1966) Talanta 13:1468
Charlot G, Bezier D (1957) Quantitative inorganic analysis. Wiley, New York, p 623
Marinenko J, Mei L (1974) J Res US Geol Surv 2:701
Budevsky O, Johnova L (1965) Talanta 12:291
Sandell EB (1961) Colorimetric determination of traces of metals, third edition. Wiley-Interscience, New York
Snell FD (1978) Photometric and fluorometric methods of analysis: metals. Wiley, New York
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Rao, R.R., Khopkar, S.M. Liquid anion-exchange separation of vanadium from malonate media. Fresenius J Anal Chem 343, 475–481 (1992). https://doi.org/10.1007/BF00322153
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF00322153