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A contribution to the study of thorium and neptunium (IV) complexes in acidic phosphoric media; Contribution a l`etude des complexes de thorium et de neptunium (IV) en milieux phosphoriques acides

Abstract

The thorium and neptunium (IV) phosphate complexes formation in acidic media has been investigated, essentially at the indicator`s level with {sup 227} Th, {sup 234} Th, {sup 235} Np and {sup 239} Np. Solvent extraction, a commonly used method for determining stability constants in solutions, was used with HDEHP in toluene. In order to get a better understanding of inorganic transparent gels formation in phosphoric aqueous solutions, the effect of the thorium concentration is also studied. Specific experimental conditions have been chosen in order to avoid the formation of chelate and hydrolysis in the aqueous solution. The equilibrium constants and stability constants are calculated, and the results are compared with literature. The results show that increasing the thorium concentration does not lead to polymer forms. refs., 42 figs., 19 tabs.
Authors:
Publication Date:
Nov 30, 1995
Product Type:
Thesis/Dissertation
Report Number:
IPNO-T-95-08
Reference Number:
SCA: 400202; PA: AIX-28:011870; EDB-97:027869; NTS-97:006710; SN: 97001729827
Resource Relation:
Other Information: TH: These (D. es Sc.).; PBD: 30 Nov 1995
Subject:
40 CHEMISTRY; NEPTUNIUM COMPLEXES; CHEMICAL PREPARATION; THORIUM COMPLEXES; AQUEOUS SOLUTIONS; CHELATING AGENTS; CHEMICAL ANALYSIS; GELS; NEPTUNIUM COMPOUNDS; NEPTUNIUM 235; NEPTUNIUM 239; PERCHLORIC ACID; PHOSPHATES; PHOSPHORIC ACID; PRECIPITATION; SOLVENT EXTRACTION; STABILITY; THORIUM PHOSPHATES; THORIUM 227; THORIUM 234
OSTI ID:
424785
Research Organizations:
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire; Paris-11 Univ., 91 - Orsay (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE97611877; TRN: FR9601095011870
Availability:
INIS; OSTI as DE97611877
Submitting Site:
FRN
Size:
131 p.
Announcement Date:

Citation Formats

Ghafar, M. A contribution to the study of thorium and neptunium (IV) complexes in acidic phosphoric media; Contribution a l`etude des complexes de thorium et de neptunium (IV) en milieux phosphoriques acides. France: N. p., 1995. Web.
Ghafar, M. A contribution to the study of thorium and neptunium (IV) complexes in acidic phosphoric media; Contribution a l`etude des complexes de thorium et de neptunium (IV) en milieux phosphoriques acides. France.
Ghafar, M. 1995. "A contribution to the study of thorium and neptunium (IV) complexes in acidic phosphoric media; Contribution a l`etude des complexes de thorium et de neptunium (IV) en milieux phosphoriques acides." France.
@misc{etde_424785,
title = {A contribution to the study of thorium and neptunium (IV) complexes in acidic phosphoric media; Contribution a l`etude des complexes de thorium et de neptunium (IV) en milieux phosphoriques acides}
author = {Ghafar, M}
abstractNote = {The thorium and neptunium (IV) phosphate complexes formation in acidic media has been investigated, essentially at the indicator`s level with {sup 227} Th, {sup 234} Th, {sup 235} Np and {sup 239} Np. Solvent extraction, a commonly used method for determining stability constants in solutions, was used with HDEHP in toluene. In order to get a better understanding of inorganic transparent gels formation in phosphoric aqueous solutions, the effect of the thorium concentration is also studied. Specific experimental conditions have been chosen in order to avoid the formation of chelate and hydrolysis in the aqueous solution. The equilibrium constants and stability constants are calculated, and the results are compared with literature. The results show that increasing the thorium concentration does not lead to polymer forms. refs., 42 figs., 19 tabs.}
place = {France}
year = {1995}
month = {Nov}
}