Study of the extraction of phosphomolybdic acid by radiotracers and application to the titration of phosphorus in steels

N. Hamiti; N. Jaffrezic-Renault; G. Revel; C. Poitrenaud

doi:10.1007/bf02037323

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 90: Issue 1

Study of the extraction of phosphomolybdic acid by radiotracers and application to the titration of phosphorus in steels

Authors:

N. Hamiti

N. Hamiti C. E. N./Saclay Laboratoire “Pierre Süe” C. N. R. S. 91191 Gif-sur-Yvette Cedex (France)

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N. Jaffrezic-Renault

N. Jaffrezic-Renault C. E. N./Saclay Laboratoire “Pierre Süe” C. N. R. S. 91191 Gif-sur-Yvette Cedex (France)

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G. Revel

G. Revel C. E. N./Saclay Laboratoire “Pierre Süe” C. N. R. S. 91191 Gif-sur-Yvette Cedex (France)

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, and

C. Poitrenaud

C. Poitrenaud I. N. S. T. N.-C. E. N./Saclay Section des Enseignements de Chimie 91191 Gif-sur-Yvette Cedex (France)

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Pages:: 77–89

Online Publication Date:: 14 Aug 2005

Publication Date:: 17 May 1985

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02037323

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Abstract

We studied the extraction of phosphomolybdic acid labelled with⁹⁹Mo and³²P and of other species extracted. From the influence of the acidity and of the concentration of excess molybdenum on the distribution coefficient of phosphorus, we propose the following equilibrium for the formation of phosphomolybdate in our experimental conditions

\documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $$12/7H_6 Mo_7 O_{24} + H_3 PO_4 \rightleftharpoons PMo_{12} O_{40}^{3 - } + 3H^ + + 36/7H_2 O.$$ \end{document}

We show that the best yield of extraction is obtained with isobutyl acetate. From the relation between the quantities of molybdenum and phosphorus extracted, extraction of

free

molybdenum has been shown. It can be eliminated by washing the organic phase with a 5M HNO₃ solution. Subsequently we test a method using radioactive molybdenum, proposed by J. E. KENNEY and M. P. MENON¹ for the titration of phosphorus in steels. Because of the presence of interfering elements (Nb, Zr, Ti, V, Si, etc.) specific conditions for the extraction of phosphomolybdic acid have to be found for the application of this method to steels.

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Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

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Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)