Distribution and fractionation of rare earth elements in suspended sediment of the Zhujiang River, Southwest China

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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Sources and control factors of rare earth elements in Late Permian mudstones, Southwest China

Journal of Central South University ◽

10.1007/s11771-012-1201-4 ◽

2012 ◽

Vol 19 (6) ◽

pp. 1741-1752 ◽

Cited By ~ 3

Author(s):

Ming-guo Xiao ◽

Xin-guo Zhuang ◽

Wei Yi ◽

Wan-hui Mao

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Southwest China ◽

Late Permian ◽

Control Factors ◽

And Control

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Enrichment and Release of Rare Earth Elements during Weathering of Sedimentary Rocks in Wujiang Catchments, Southwest China

Journal of Rare Earths ◽

10.1016/s1002-0721(06)60149-x ◽

2006 ◽

Vol 24 (4) ◽

pp. 491-496 ◽

Cited By ~ 21

Author(s):

Zhaoliang Song ◽

Congqiang Liu ◽

Guilin Han ◽

Zhongliang Wang ◽

Zhaozhou Zhu ◽

...

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Southwest China ◽

Sedimentary Rocks

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

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph18020502 ◽

2021 ◽

Vol 18 (2) ◽

pp. 502

Author(s):

Ruiyin Han ◽

Zhifang Xu

Keyword(s):

Rare Earth ◽

Rare Earth Elements ◽

Southwest China ◽

Secondary Forest ◽

Soil Samples ◽

Soil Profiles ◽

Agricultural Activities ◽

Soil Environment ◽

Forest Land ◽

Abandoned Cropland

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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