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Fluorometric determination of samarium and europium in rare earth minerals with. beta. -diketoneternary complex

Journal Article:

Abstract

This communication reported the optimum conditions for the fluorometric determination of these ions, and the method was adopted in the simultaneous determination of samarium and europium in xenotime and monazite minerals. From the experimental results on the effect of diverse ions and the extraction pH of the aqueous phase, it became clear that TTA-TOPO hexane method was the best system for the determination of samarium and europium because of the highest fluorescence sensitivity of the ternary complex, and also because the lower extraction pH eliminated the effect of diverse ions. Moreover, the very high detection limit (2 ppb) of Sm was achieved by the use of a red sensitive photomultiplier. Which was used at 644 nm, and that of Eu (0.02 ppb) at 614 nm. The procedure was established as follows: The rare earth minerals (xenotime, monazite) sample was treated with hot conc. H/sub 2/SO/sub 4/ and twice precipitated with 0.5 mol dm/sup -3/ oxalic acid (pH was adjusted to 2.0 -- 2.2). Then the precipitate was filtered and ignited to give the rare earth oxide. Fifty milligrams of the oxide was dissolved in HCl and diluted with water in order to obtain the solution containing 5 ..mu..g cm/sup -3/  More>>
Authors:
Huang, H; Hiraki, K; Nishikawa, Y [1] 
  1. Kinki Univ., Higashi-Osaka, Osaka (Japan). Faculty of Science and Technology
Publication Date:
Jul 01, 1981
Product Type:
Journal Article
Reference Number:
AIX-13-694882; EDB-82-164833
Resource Relation:
Journal Name: Bunseki Kagaku; (Japan); Journal Volume: 30:7
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; EUROPIUM; FLUORESCENCE SPECTROSCOPY; SAMARIUM; ACCURACY; EUROPIUM COMPLEXES; INTERFERING ELEMENTS; MONAZITES; PH VALUE; QUANTITATIVE CHEMICAL ANALYSIS; QUANTITY RATIO; SAMARIUM COMPLEXES; SOLVENT EXTRACTION; TOPO; TTA; XENOTIME; ACTINIDE COMPOUNDS; CHEMICAL ANALYSIS; COMPLEXES; ELEMENTS; EMISSION SPECTROSCOPY; EXTRACTION; HETEROCYCLIC COMPOUNDS; KETONES; MATERIALS; METALS; MINERALS; ORGANIC COMPOUNDS; ORGANIC FLUORINE COMPOUNDS; ORGANIC HALOGEN COMPOUNDS; ORGANIC PHOSPHORUS COMPOUNDS; ORGANIC SULFUR COMPOUNDS; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS COMPOUNDS; RADIOACTIVE MATERIALS; RADIOACTIVE MINERALS; RARE EARTH COMPLEXES; RARE EARTH COMPOUNDS; RARE EARTHS; SEPARATION PROCESSES; SPECTROSCOPY; THORIUM COMPOUNDS; THORIUM MINERALS; THORIUM PHOSPHATES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; YTTRIUM PHOSPHATES; 400104* - Spectral Procedures- (-1987); 400102 - Chemical & Spectral Procedures
OSTI ID:
6939060
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Journal ID: CODEN: BNSKA
Submitting Site:
HEDB
Size:
Pages: 452-460
Announcement Date:

Journal Article:

Citation Formats

Huang, H, Hiraki, K, and Nishikawa, Y. Fluorometric determination of samarium and europium in rare earth minerals with. beta. -diketoneternary complex. Japan: N. p., 1981. Web.
Huang, H, Hiraki, K, & Nishikawa, Y. Fluorometric determination of samarium and europium in rare earth minerals with. beta. -diketoneternary complex. Japan.
Huang, H, Hiraki, K, and Nishikawa, Y. 1981. "Fluorometric determination of samarium and europium in rare earth minerals with. beta. -diketoneternary complex." Japan.
@misc{etde_6939060,
title = {Fluorometric determination of samarium and europium in rare earth minerals with. beta. -diketoneternary complex}
author = {Huang, H, Hiraki, K, and Nishikawa, Y}
abstractNote = {This communication reported the optimum conditions for the fluorometric determination of these ions, and the method was adopted in the simultaneous determination of samarium and europium in xenotime and monazite minerals. From the experimental results on the effect of diverse ions and the extraction pH of the aqueous phase, it became clear that TTA-TOPO hexane method was the best system for the determination of samarium and europium because of the highest fluorescence sensitivity of the ternary complex, and also because the lower extraction pH eliminated the effect of diverse ions. Moreover, the very high detection limit (2 ppb) of Sm was achieved by the use of a red sensitive photomultiplier. Which was used at 644 nm, and that of Eu (0.02 ppb) at 614 nm. The procedure was established as follows: The rare earth minerals (xenotime, monazite) sample was treated with hot conc. H/sub 2/SO/sub 4/ and twice precipitated with 0.5 mol dm/sup -3/ oxalic acid (pH was adjusted to 2.0 -- 2.2). Then the precipitate was filtered and ignited to give the rare earth oxide. Fifty milligrams of the oxide was dissolved in HCl and diluted with water in order to obtain the solution containing 5 ..mu..g cm/sup -3/ rare earth oxide. An aliquot of the solution ((1.0 -- 3.0) cm/sup 3/) was adjusted to pH 5.5 with sodium acetate and shaken with 1 x 10/sup -4/ mol dm/sup -3/ TTA- 2 x 10/sup -2/ mol dm/sup -3/ TOPO hexane solution. Then the fluorescence intensity of the organic layer was measured at 644 nm for Sm and 614 nm for Eu. In this procedure, the recovery of Sm and Eu was found to be about 96%. Xenotime contained 0.70% of Sm and 0.004% of Eu, and monazite contained 1.84% of Sm and 0.003% of Eu.}
journal = {Bunseki Kagaku; (Japan)}
volume = {30:7}
journal type = {AC}
place = {Japan}
year = {1981}
month = {Jul}
}