Spatial distribution, source identification, and risk assessment of heavy metals in riparian soils of the Tibetan plateau.
Environ Res
; 237(Pt 2): 116977, 2023 Nov 15.
Article
en En
| MEDLINE
| ID: mdl-37625542
ABSTRACT
Riparian soils in the lower sections of the Lhasa River were chosen as the research focus, to examine the characteristics and sources of heavy metals in riparian soils of high-cold regions. To investigate the influence of various factors on the geographical distribution of heavy metals, three horizontal and one vertical profiles were considered. The geoaccumulation index, prospective ecological risk index, and enrichment factor were used to evaluate the extent of soil contamination. Correlation analysis and the positive-matrix-analysis receptor model were used to quantitatively examine the sources of the elements. According to the soil-evaluation, the topsoil was more polluted than the deep soil. Overall, the soil was slightly degraded and posed minor ecological concern. Cd was the primary contributor to the overall contamination, with moderate and considerable risk levels at certain locations. Five sources were identified for the six heavy metals. Transportation and agricultural production were the principal sources of Cd. Ni and Cr were mostly connected to agricultural practices and weathering of parent-soil materials. Pb and Zn were mostly related to geological history, geothermal development, and traffic pollution. Mineral resource development has had a major impact on Cu. Non-carcinogenic risk index of each heavy metal and their total value were <1, indicating they are not harmful to human health. The riparian soil of the Lhasa River Basin contains heavy metals from various sources; therefore, it is important to monitor these heavy metals. This study provides a scientific foundation for the safe utilization and classification of soils in high cold regions.
Texto completo:
1
Colección:
01-internacional
Tipo de estudio:
Diagnostic_studies
/
Etiology_studies
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Prognostic_studies
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Risk_factors_studies
Idioma:
En
Revista:
Environ Res
Año:
2023
Tipo del documento:
Article
País de afiliación:
China