Practical guidelines for representing and interpreting rare earth abundances in environmental and biological studies

Barrat, Jean-Alix; Bayon, Germain

doi:10.1016/j.chemosphere.2024.141487

Cited by 4 publications

(4 citation statements)

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“…We divided the REE content of a sample by the REE literature values in the Post-Archean Australian shale (PAAS) and plotted the results on a logarithmic scale according to the atomic number from La to Lu. The plot showed smooth variations, known as the shale-normalized (SN) REE pattern. , Depending on their redox states, Ce and Eu may appear as tetravalent and divalent ions, respectively, causing anomalies in their abundance in environmental materials. The anomaly degree is widely known to reflect the history and fingerprint of material in earth sciences .…”

Section: Introductionmentioning

confidence: 99%

“…The anomaly degree is widely known to reflect the history and fingerprint of material in earth sciences . The importance of quantifying REE abundance in environmental and ecological risk and toxicity studies has recently received considerable attention. , …”

Section: Introductionmentioning

confidence: 99%

“…The plot showed smooth variations, known as the shalenormalized (SN) REE pattern. 2,3 Depending on their redox states, Ce and Eu may appear as tetravalent and divalent ions, respectively, causing anomalies in their abundance in environmental materials. The anomaly degree is widely known to reflect the history and fingerprint of material in earth sciences.…”

Section: ■ Introductionmentioning

confidence: 99%

“…1 The importance of quantifying REE abundance in environmental and ecological risk and toxicity studies has recently received considerable attention. 3,4 Gadolinium Anomaly. Even if the valences of La, Gd, and Lu ions remain unchanged, their electronic configurations (with no, half-filled, and full-filled 4f-electron subshells) facilitate complex formation with organic substances in water, resulting in higher solubility than that of their neighboring elements.…”

Section: ■ Introductionmentioning

confidence: 99%

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Hospital Effluent as a New Source of Anthropogenic Lanthanum in the Environment

Aktar,

Toyoda

2024

Environ. Sci. Technol. Lett.

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Excess gadolinium (Gd) in the environment, originating from Gd-chelating contrast agents present in hospital wastewater, has been extensively studied as a micropollutant. However, the source of excessive lanthanum (La) levels in the environment remains unclear. In this study, we analyzed rare earth elements (REEs) in treated water from 12 wastewater treatment plants (WWTPs) and sewage sludge/incinerated ash from two sludge treatment centers in Sapporo, Japan, during 2019−2020. We found that the annual discharge of excess Gd and La in a treatment area positively correlated with the number of hospitals in that area. The excess Gd concentration in the treated water increased by an order of magnitude late at night Monday, whereas the excess La concentration remained constant. Sequential extraction experiments on sewage sludge revealed that excess La is predominantly incorporated in phosphate, not silicate, as in zeolite catalysts. We identified lanthanum carbonate tablets (e.g., Fosrenol), prescribed daily to kidney patients to prevent hyperphosphatemia, as the source of excess La. Due to its low solubility, most of the anthropogenic lanthanum settles as sewage sludge in WWTPs, and only a small percentage is released into treated water. This raises concerns about the potential degradation of natural REE patterns in the environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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