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Method of rare earths determination, with separation pre-irradiation followed by neutron activation analysis. Using of brazilian standards BB-1 and GB-1; Metodo de determinacao de terras raras, com separacao pre-irradiacao seguida de ativacao neutronica. Aplicacao aos padroes brasileiros BB-1 e Gb-1

Miscellaneous:

Abstract

In order to determine the rare earth elements (REE) in rocks, by neutron activation analysis, a group separation, before irradiation, was developed. The brazilian geological standards BB-1 and GB-1, provided by Instituto de Geociencias da Universidade da Bahia, were analyzed. The method was based an acid digestion of the samples, cation exchange separation with a Dowex 50WX8 column and coprecipitation of the REE with calcium oxalate. Interferers like U, Th, Ta and Fe were eliminated. The concentration values of ten REE (La, Ce, Pr, Nd, Sm, Eu, Tb, Ho, Yb and Lu) were determined. The analysis of Pr brought a contribution to the knowledge of the REE contents in these geological standards, since there are not yet results in the literature. The other REE data obtained were compared with literature values and some discrepancies are discussed. (author).
Authors:
Alcala, A; Figueiredo, A M.G.; [1]  Marques, L S; Astolfo, R [2] 
  1. Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)
  2. Sao Paulo Univ., SP (Brazil). Inst. Astronomico e Geofisico
Publication Date:
Dec 31, 1992
Product Type:
Miscellaneous
Report Number:
INIS-BR-3088
Reference Number:
SCA: 540211; 400105; 400101; PA: AIX-24:000080; SN: 93000912533
Resource Relation:
Other Information: PBD: [1992]
Subject:
54 ENVIRONMENTAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; RARE EARTHS; NEUTRON ACTIVATION ANALYSIS; ROCKS; CALCIUM COMPOUNDS; COPRECIPITATION; HYDROCHLORIC ACID; ORGANIC ION EXCHANGERS; OXALATES; STANDARDS; 540211; 400105; 400101; RADIOMETRIC TECHNIQUES; SEPARATION PROCEDURES; ACTIVATION, NUCLEAR REACTION, RADIOMETRIC, AND RADIOCHEMICAL PROCEDURES
OSTI ID:
10108442
Research Organizations:
Instituto de Pesquisas Energeticas e Nucleares (IPEN), Sao Paulo, SP (Brazil)
Country of Origin:
Brazil
Language:
Portuguese
Other Identifying Numbers:
Other: ON: DE93608793; TRN: BR9230515000080
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
[11] p.
Announcement Date:
Jun 30, 2005

Miscellaneous:

Citation Formats

Alcala, A, Figueiredo, A M.G., Marques, L S, and Astolfo, R. Method of rare earths determination, with separation pre-irradiation followed by neutron activation analysis. Using of brazilian standards BB-1 and GB-1; Metodo de determinacao de terras raras, com separacao pre-irradiacao seguida de ativacao neutronica. Aplicacao aos padroes brasileiros BB-1 e Gb-1. Brazil: N. p., 1992. Web.
Alcala, A, Figueiredo, A M.G., Marques, L S, & Astolfo, R. Method of rare earths determination, with separation pre-irradiation followed by neutron activation analysis. Using of brazilian standards BB-1 and GB-1; Metodo de determinacao de terras raras, com separacao pre-irradiacao seguida de ativacao neutronica. Aplicacao aos padroes brasileiros BB-1 e Gb-1. Brazil.
Alcala, A, Figueiredo, A M.G., Marques, L S, and Astolfo, R. 1992. "Method of rare earths determination, with separation pre-irradiation followed by neutron activation analysis. Using of brazilian standards BB-1 and GB-1; Metodo de determinacao de terras raras, com separacao pre-irradiacao seguida de ativacao neutronica. Aplicacao aos padroes brasileiros BB-1 e Gb-1." Brazil.
@misc{etde_10108442,
title = {Method of rare earths determination, with separation pre-irradiation followed by neutron activation analysis. Using of brazilian standards BB-1 and GB-1; Metodo de determinacao de terras raras, com separacao pre-irradiacao seguida de ativacao neutronica. Aplicacao aos padroes brasileiros BB-1 e Gb-1}
author = {Alcala, A, Figueiredo, A M.G., Marques, L S, and Astolfo, R}
abstractNote = {In order to determine the rare earth elements (REE) in rocks, by neutron activation analysis, a group separation, before irradiation, was developed. The brazilian geological standards BB-1 and GB-1, provided by Instituto de Geociencias da Universidade da Bahia, were analyzed. The method was based an acid digestion of the samples, cation exchange separation with a Dowex 50WX8 column and coprecipitation of the REE with calcium oxalate. Interferers like U, Th, Ta and Fe were eliminated. The concentration values of ten REE (La, Ce, Pr, Nd, Sm, Eu, Tb, Ho, Yb and Lu) were determined. The analysis of Pr brought a contribution to the knowledge of the REE contents in these geological standards, since there are not yet results in the literature. The other REE data obtained were compared with literature values and some discrepancies are discussed. (author).}
place = {Brazil}
year = {1992}
month = {Dec}
}