General Geochemical Properties and Abundances of the Rare Earth Elements

Henderson, Paul

doi:10.1016/b978-0-444-42148-7.50006-x

Cited by 297 publications

(168 citation statements)

References 45 publications

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“…(e.g., Faure, 1986;Gromet and Silver, 1983;Henderson, 1984). As the JG-1 and JG-la standard rocks are Cretaceous in age (85 Ma) (Ando et al, 1987), the present values of '43Nd / 144Nd are expected to be different between mineral phases.…”

Section: Resultsmentioning

confidence: 99%

143Nd/144Nd ratios of twelve GSJ rock reference samples and reproducibility of the data.

Arakawa

1992

Geochem. J.

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Section: Resultsmentioning

confidence: 99%

143Nd/144Nd ratios of twelve GSJ rock reference samples and reproducibility of the data.

Arakawa

1992

Geochem. J.

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“…The log K d (org/aq)'s for Ln(III) in the solventextraction systems by Peppard et al (1969) are analogous to the Masuda-Coryell plot for REE patterns of geochemical samples (Masuda, 1962;Coryell et al, 1963;Henderson, 1984). The REE patterns show Ln concentrations normalized by chondrite on the logarithmic scale against the atomic number (Z) of Ln.…”

Section: Peppard's Logk D (Org/aq) Analogous To Masudacoryell Plot Fomentioning

confidence: 99%

The original examples of lanthanide tetrad effect in solvent extraction: A new interpretation compatible with recent progress in REE geochemistry.

Kawabe

Masuda²

2001

Geochem. J.

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Geochmeical studies reporting lanthanide tetrad effects in natural samples often cite the original examples of tetrad effect depicted by logK d (org/aq) for Ln(III) in the two solvent-extraction systems (Peppard et al., 1969) and its theoretical interpretation (Jørgensen, 1970;Nugent, 1970). An improved equation for the refined spin-pairing energy theory (RSPET), which has been developed in pursuing tetrad effects in geochemical studies, makes it possible to examine more thoroughly the original examples of tetrad effect by using the digitized logK d (org/aq) data. The logK d (org/aq) values are found to be successfully described by the RSPET equation. Our analyses show that the ratios of relative differences in Racah parameters for Ln 3+ ions in aqueous and organic phases, ∆E 3 /∆E 1 , are 0.29 ± 0.07 and 0.25 ± 0.06 for the two extraction systems. They are comparable with the spectroscopic observations of nephelauxetic effect in Nd(III) compounds (∆E 3 /∆E 1 = 0.23 ± 0.02). The tetrad effects in logK d (org/aq) are experimental evidence for the thermochemical consequence of the nephelauxetic effect in Ln(III) complexes. Although Ln 3+ ions in condensed phases are atomic-like, it is rather surprising that logK d (org/aq) can easily be reproduced by the simple RSPET equation derived from the Slater-Condon-Racah theory for free Ln 3+ ions in vacuum. The effect of coordination change of Ln 3+ ion across the Ln 3+ (aq) series is not obvious in the series variations of logK d (org/aq), suggesting that the coordination changes in the two Ln(III) complex series in the extraction systems are significantly canceled out in ∆G r°. The two sets of logK d (org/aq) are analogous to the Masuda-Coryell plot in REE geochemistry with respect to their coordinates. This gives an insight into the fact that the Masuda-Coryell plot also depicts tetrad effects in the REE patterns for geochemical samples.

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“…REEs are comprising of Light REEs (LREEs) and Heavy REEs (HREEs) including all the lanthanides and actinides [15]. The communication [16] also reported the presence of Ce and Nd (LREEs) in monazite sample was comparatively higher than other REEs in the samples of both Chavara and Manavalakurichi.…”

Section: Bacillus Cereus Eu693511 Sc18mentioning

confidence: 99%

Bioaccumulation of cerium and neodymium by Bacillus cereus isolated from rare earth environments of Chavara and Manavalakurichi, India

Emmanuel¹,

Vignesh²,

Anandkumar

et al. 2011

Indian J Microbiol

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Rare earth elements (REEs) are among the common minerals in the Rare earth environment that are very precious and also enhance soil properties. The aim of this present study is to evaluate the accumulation of REEs by bacterial isolates of rare earth environment. Morphological and biochemical characterization were done for 37 bacterial isolates and also molecular studies were carried out using 16S rRNA sequencing method. The assessment of REEs composition in soil samples of Chavara and Manavalakurichi analyzed using Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) showed the abundance of Cerium and Neodymium among lanthanides. The bioaccumulation study of rare earth elements by Bacillus cereus were accomplished employing FT-IR spectrum and ICP-OES analysis. The significant accumulation of rare earth elements especially Cerium and Neodymium was noticed in Bacillus cereus isolated from rare earth environment.

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General Geochemical Properties and Abundances of the Rare Earth Elements

Cited by 297 publications

References 45 publications

143Nd/144Nd ratios of twelve GSJ rock reference samples and reproducibility of the data.

143Nd/144Nd ratios of twelve GSJ rock reference samples and reproducibility of the data.

The original examples of lanthanide tetrad effect in solvent extraction: A new interpretation compatible with recent progress in REE geochemistry.

Bioaccumulation of cerium and neodymium by Bacillus cereus isolated from rare earth environments of Chavara and Manavalakurichi, India

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