Solvent extraction of hafnium(IV): XXII. Extraction by N-benzoyl-N-phenyl hydroxylamine from water-dimethyl sulfoxide and water-dimethyl formamide solutions

J. Příhoda; J. Hála

doi:10.1007/bf02516967

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 30: Issue 2

Solvent extraction of hafnium(IV)

XXII. Extraction by N-benzoyl-N-phenyl hydroxylamine from water-dimethyl sulfoxide and water-dimethyl formamide solutions

Authors:

J. Příhoda

J. Příhoda J. E. Purkyně University Department of Inorganic Chemistry Kotlářská 2 61137 Brno (Czechoslovakia)

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J. Hála

J. Hála J. E. Purkyně University Department of Inorganic Chemistry Kotlářská 2 61137 Brno (Czechoslovakia)

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Pages:: 343–352

Online Publication Date:: 09 Jan 2007

Publication Date:: 01 Sep 1976

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02516967

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Abstract

Solvent extraction of^175,181Hf(IV) into solutions of HBPHA^** in CHCl₃, tetrachloro ethane (C₂H₂Cl₄), CCl₄ and benzene from mixtures of water with DMSO or DMFA at 2M HClO₄ formal acidity was studied. With diluents containing acidic hydrogen (CHCl₃, C₂H₂Cl₄) the presence of DMSO or DMFA in the extraction system leads to an increased extractability of the Hf(IV) chelate. Possible reasons for this synergism are discussed. Extractions into benzene and CCl₄, as well as those into CHCl₃ and C₂H₂Cl₄ at high DMSO and DMFA concentrations, are antagonistic. This is caused by the decrease of the partition coefficient of HBPHA, and changes in the solvation of Hf(IV) ion in the polar phase. The latter effect is very strong at high DMSO concentrations, and with macroconcentrations of Hf(IV) finally leads to precipitation of crystalline adducts Hf(ClO₄)₄·xDMSO (x=7–8).

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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)