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Determination of rare earth elements in Fe-minerals using external calibration by LA-ICP-MS and application on Cauê Iron Formation (Brazil).

Authors :
Sousa, Denise V.M.
Abreu, Adriana T.
Sampaio, Geraldo M.S.
Lana, Cristiano C.
Rodrigues, Daniel A.S.
Nalini, Hermínio A.
Source :
Talanta. Nov2020, Vol. 219, pN.PAG-N.PAG. 1p.
Publication Year :
2020

Abstract

The rare earth elements (REE) composition in Fe-mineral phases is an important tool in iron formation studies to obtain information about parent rocks and environmental and paragenetic processes. However, the determination of REE presents some difficulties, such as the low concentration of these elements, matrix complexity and lack of iron matrix certified reference materials. The aim of the present work is to propose an analytical method to determine the REE plus Y (REE + Y) contents at trace levels in Fe-(hydr)oxides by the laser ablation ICP-quadrupoleMS technique, using external calibration. The calibration curves were obtained from analyses of reference materials with different matrices, and the analytical conditions were checked on the NIST 614 glass. The linearity (R2 ≥ 0.98), limit of detection (0.002–0.044 μg g−1), limit of quantification (0.008–0.146 μg g−1), recovery (88.4–112.4%), and intraday (0.1–14.1%) and interday (1.6–17.8%) precision were systematically assessed. The results obtained showed that the method is fit for the purpose and showed evidence of a nonsignificant interference of the matrix. Thus, the developed procedure was applied in the analyses of magnetite, martite, hematite, and goethite grains from Cauê Iron Formation (Brazil). The REE + Y patterns of the minerals are consistent with the previous study of bulk analyses on whole rocks and highlight the postdepositional signature of these elements in banded iron formations. Image 1 • It is a challenge to measure REE + Y in Fe-rich samples without certified reference materials. • Efficient external calibration combined with various matrices for REE + Y analyses. • In situ analyses by an LA-ICP-MS system of fused glass beads used in XRF. • REE + Y patterns of Fe-minerals from Quadrilátero Ferrífero (Brazil) obtained by LA-ICP-MS. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00399140
Volume :
219
Database :
Academic Search Index
Journal :
Talanta
Publication Type :
Academic Journal
Accession number :
145408779
Full Text :
https://doi.org/10.1016/j.talanta.2020.121239