Geochemical Behaviors of Rare Earth Elements (REEs) in Karst Soils under Different Land-Use Types: A Case in Yinjiang Karst Catchment, Southwest China

The geochemical characteristics of rare earth elements (REEs) can be employed to identify the anthropogenic and natural influence on the distributions of REEs in soils. A total of 47 soil samples from the three soil profiles of the secondary forest land, abandoned cropland, and shrubland in the Yinjiang county of Guizhou province, southwest China, were collected to determine the contents and distribution of REEs in the soil environment. The total REEs (ΣREE) contents in different soil profiles are in the following sequence: secondary forest land (mean: 204.59 mg·kg−1) > abandoned cropland (mean: 186.67 mg·kg−1) > shrubland (mean: 139.50 mg·kg−1). The ratios of (La/Gd)N and (Gd/Yb)N ranged from 0.62 to 1.00 and 1.18 to 2.16, which indicated that the enrichment of the medium rare earth elements (MREEs) was more obvious than that of the light rare earth elements (LREEs) and the heavy rare earth elements (HREEs). The phenomenon could be attributed to the preferential absorption of MREEs by fine particles and the substitution of Ca2+ by MREEs. Most soil samples were characterized by the negative Ce anomalies (anomalies values: 0.30–1.10) and positive Eu anomalies (anomalies values: 0.43–2.90). The contents of REEs in the profiles of secondary forest land and shrubland were mainly regulated by soil pH and Fe contents while clay content and agricultural activities were the main controlling factors in the soil profile of abandoned cropland. This study highlights the role of agricultural activities in affecting the distributions of REEs in karst soils, which could provide some insights for the protection of the soil environment.

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Ore genesis of the Yadu carbonate-hosted Pb–Zn deposit in Southwest China: Evidence from rare earth elements and C, O, S, Pb, and Zn isotopes

Ore Geology Reviews ◽

10.1016/j.oregeorev.2021.104039 ◽

2021 ◽

Vol 131 ◽

pp. 104039

Author(s):

Zhiwei He ◽

Zeqin Li ◽

Bo Li ◽

Jun Chen ◽

Zuopeng Xiang ◽

...

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Southwest China ◽

Ore Genesis ◽

Zn Isotopes

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Distribution and fractionation of rare earth elements in sediments and mangrove soil profiles across an estuarine gradient

Chemosphere ◽

10.1016/j.chemosphere.2020.128431 ◽

2021 ◽

Vol 264 ◽

pp. 128431

Author(s):

Tácila O.P. de Freitas ◽

Rodrigo M.A. Pedreira ◽

Vanessa Hatje

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Soil Profiles ◽

Estuarine Gradient ◽

Mangrove Soil

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The distribution of rare earth elements and sources in Maoshitou reservoir affected by acid mine drainage, Southwest China

Journal of Geochemical Exploration ◽

10.1016/j.gexplo.2019.03.019 ◽

2019 ◽

Vol 202 ◽

pp. 92-99 ◽

Cited By ~ 2

Author(s):

Xingxing Cao ◽

Shaoqi Zhou ◽

Feng Xie ◽

Rong Rong ◽

Pan Wu

Keyword(s):

Rare Earth ◽

Acid Mine Drainage ◽

Rare Earth Elements ◽

Southwest China ◽

Mine Drainage ◽

Acid Mine

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Rare earth elements in soil profiles of various ecosystems across Germany

Applied Geochemistry ◽

10.1016/j.apgeochem.2019.02.002 ◽

2019 ◽

Vol 102 ◽

pp. 197-217 ◽

Cited By ~ 4

Author(s):

Julia Mihajlovic ◽

Albrecht Bauriegel ◽

Hans-Joachim Stärk ◽

Niko Roßkopf ◽

Jutta Zeitz ◽

...

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Soil Profiles

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Rare Earth Elements Accumulation in the Hair of Malagasy Children and Adolescents in Relation to Their Age and Nutritional Status

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph19010455 ◽

2022 ◽

Vol 19 (1) ◽

pp. 455

Author(s):

Magdalena Zielińska-Dawidziak ◽

Magdalena Czlapka-Matyasik ◽

Zofia Wojciechowska ◽

Jędrzej Proch ◽

Ryszard Kowalski ◽

...

Keyword(s):

Rare Earth ◽

Nutritional Status ◽

Rare Earth Elements ◽

Inductively Coupled Plasma ◽

Scalp Hair ◽

Optical Emission ◽

Mean Value ◽

Soil Samples ◽

Inductively Coupled ◽

The Mean

Due to undesired influence, the accumulation of rare earth elements (REE) in the human body has been discussed recently. However, it is usually limited to the study of the population living where REE ores and mines are located. The aim of the experiment presented was to analyse the concentration of REE in the hair of children and teenagers living in two areas of Madagascar in relation to the place of residence, nutritional status, age and sex. REE concentration was determined in scalp hair of 262 of subjects (5–19 years old) by an inductively coupled plasma-optical emission spectrometer. The content of total REE in the Malagasy hair was in the range of 0.79–44.15 mg/kg. The nutritional status was evaluated by Cole’s index, and malnutrition of children was observed more often in village areas. The concentration of these elements was also determined in 20 samples for the estimation of environmental exposure. No significant differences were detected in the content of these elements in the studied regions, although the mean value was always higher in soil samples from the Antananariva region. The obtained data suggest dependence between REE concentration in the hair and age, and nutritional status of the examined subjects. Even if the observed correlations are weak, they contribute significant knowledge on the accumulation of REE in the bodies of children living in areas that are not recognised as deposits of these elements.

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Geochemistry of rare earth elements in soils under different land uses in a typical karst area, Guizhou Province, Southwest China

Canadian Journal of Soil Science ◽

10.1139/cjss-2017-0043 ◽

2017 ◽

Cited By ~ 5

Author(s):

Guilin Han ◽

Zhaoliang Song ◽

Yang Tang

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Southwest China ◽

Guizhou Province ◽

Karst Area ◽

Land Uses

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Geochemical Distribution Characteristics of Rare Earth Elements in Different Soil Profiles in Mun River Basin, Northeast Thailand

Sustainability ◽

10.3390/su12020457 ◽

2020 ◽

Vol 12 (2) ◽

pp. 457 ◽

Cited By ~ 2

Author(s):

Wenxiang Zhou ◽

Guilin Han ◽

Man Liu ◽

Chao Song ◽

Xiaoqiang Li

Keyword(s):

Rare Earth ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Rare Earth Elements ◽

River Basin ◽

Soil Ph ◽

Enrichment Factors ◽

Soil Profiles ◽

Distribution Characteristics ◽

Northeast Thailand

Exploring the distributions of rare earth elements (REEs) in soil profiles is essential to understanding how natural and anthropogenic factors influence the geochemical behaviors of REEs. This study aimed to learn about the distribution characteristics of REEs in soils, including their fractionation and enrichment, and to explore the influence of soil pH and soil organic carbon (SOC) on REEs. One hundred and three samples were collected from six soil profiles under different land uses (paddy field: T1, T3; forest land: T2, T6; wasteland: T4; building site: T5) in the Mun River Basin, Northeast Thailand. The average total REE contents (∑REE) are much lower (<80 mg kg−1) than that of Earth’s crust (153.80 mg kg−1) in soil profiles T2, T3, T4, and T6. The contents of REEs tend to increase slightly with depth in all soil profiles. The ratios of (La/Yb)N range from 0.35 to 0.96 in most samples, indicating that the enrichment of heavy REEs (HREEs) relative to light REEs (LREEs) is the main fractionation pattern. Samples from profile T2 show relatively obvious negative Ce anomalies (0.55–0.78) and positive Eu anomalies (1.41–1.56), but there are almost no anomalies of Ce and Eu in other soil profiles. Enrichment factors of LREEs (EFLREEs) range from 0.23 to 1.54 and EFHREEs range from 0.34 to 2.27, which demonstrates that all soil samples show no LREE enrichment and only parts of samples show minor HREE enrichment. Soil organic carbon (SOC) contents positively correlate with the enrichment factors of REEs (EFREE) in soil profiles T1 (R = 0.56, p < 0.01) and T6 (R = 0.71), while soil pH values correlate well with EFREE in soil profiles T2 (R = 0.75) and T4 (R = −0.66, p < 0.01), indicating the important influence of soil pH and SOC on the mobility of REEs in some soil profiles.

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Geochemical Characteristics of Rare Earth Elements in Soils from Puding Karst Critical Zone Observatory, Southwest China

Sustainability ◽

10.3390/su11184963 ◽

2019 ◽

Vol 11 (18) ◽

pp. 4963 ◽

Cited By ~ 7

Author(s):

Qian Zhang ◽

Guilin Han ◽

Man Liu ◽

Lingqing Wang

Keyword(s):

Rare Earth ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Rare Earth Elements ◽

Southwest China ◽

Clay Content ◽

Critical Zone ◽

Fe Content ◽

Local Soil ◽

Critical Zone Observatory

Soil samples from eight soil profiles under different land-use types were collected at the Puding Karst Critical Zone Observatory, Southwest China, to investigate the distribution, fractionation, and controlling factors of rare earth elements (REEs). The total REEs contents in topsoil ranged from 149.97 to 247.74 mg kg−1, the contents in most topsoil were higher than local soil background value (202.60 mg kg−1), and the highest content was observed in topsoil under cropland. The REEs contents in surface soils from lower slopes sites were higher than that of middle and upper slope sites, and the highest contents were observed in cropland. The PAAS-normalized REEs pattern in soils showed MREEs significantly enriched relative to LREEs and HREEs, and HREEs were enriched relative to LREEs. The results showed that clay content, pH, soil organic carbon, total phosphorus, and Fe content were the main factors influencing the distribution of REEs in karst soils, and soil organic carbon (SOC), Fe content showed better linear relationship with REEs.

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