Solvent extraction of hafnium(IV): XXI. Extraction by di-N-butyl phosphoric acid in 2-ethylhexanol

J. Hála; E. Táborská

doi:10.1007/bf02516966

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Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 30: Issue 2

Solvent extraction of hafnium(IV)

XXI. Extraction by di-N-butyl phosphoric acid in 2-ethylhexanol

Authors:

J. Hála

J. Hála J. E. Purkyně University Department of Inorganic Chemistry Kotlářská 2 611 37 Brno (Czechoslovakia)

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E. Táborská

E. Táborská J. E. Purkyně University Department of Inorganic Chemistry Kotlářská 2 611 37 Brno (Czechoslovakia)

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Pages:: 329–341

Online Publication Date:: 09 Jan 2007

Publication Date:: 01 Sep 1976

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02516966

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Abstract

^{175, 181}Hafnium(IV) was extracted by HDBP in 2-ethylhexanol from 1–10M solutions of HClO₄, HCl and HNO₃, and 1–8M H₂SO₄. As with low polar organic phase diluents, the acidity dependence of the distribution ratio of Hf, D, passes through a minimum for HClO₄, HCl, and H₂SO₄ whereas only an increase of D can be observed with increasing HNO₃ concentration. From the slope analysis the following complexes were found to be extracted (HDBP=HA): HfA₄ at <4M HClO₄ and <5M HCl, lg K_extr=9, HfX₄(HA)₄ (X=ClO ₄⁻ , Cl⁻ or NO ₃⁻ ) at >5M HClO₄, >7M HCl and 1–10M HNO₃, Hf(SO₄)A₂(HA)_3–4 at <3M H₂SO₄, and Hf(SO₄)₂ (HA)₄ at >6M H₂SO₄. Coextraction of sulphate with hafnium from H₂SO₄ solutions was evidenced in experiments with macro concentrations of Hf(IV) and³⁵SO ₄²⁻ .

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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)