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<p>The riverine riparian zone, as a transitional area connecting the soil and the river, serves as a barometer reflecting the quality of both the soil and the river. As a typical irrigation-dependent agricultural region in arid northwest China, the Kuitun River Basin relies on healthy soils to sustain agricultural productivity and maintain ecological stability. This study investigated seven potentially toxic elements (PTEs: As, Cd, Cr, Cu, Ni, Pb, Zn) in 25 riparian soil samples, using inductively coupled plasma mass spectrometry (ICP-MS) for analysis. Geo-accumulation index (<i>I</i><sub><i>geo</i></sub>), potential ecological risk index (RI), and the USEPA health risk model were applied for risk assessment, with Pearson correlation and principal component analysis (PCA) for source identification. Results showed the soils were severely saline-alkaline (average sodium adsorption ratio = 38.05, &gt; 13). The concentration of PTEs in the soils were basically consistent with the local background value in Xinjiang. Meanwhile, the ecological risks posed by PTEs were also generally within the safe threshold range based on the geo-accumulation index and potential ecological risk index. However, the areas closed to the urban river basins showed relatively high levels of Cd and Ni pollution(<i>I</i><sub><i>geo</i></sub> grades 4–5 for Ni at partial sites). Furthermore, both the non-carcinogenic risk and carcinogenic risk caused by PTEs were under the safety threshold. But, the contribution of Cr to the risk to human health accounts for 96.8%, acting as a threat to ecological safety, which needs further attention by local government.</p>

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Comprehensive Assessment of Potentially Toxic Elements in Riparian Zone Soils of Kuitun River Basin: Distribution, Ecological Risks and Human Health Implications

  • 期刊论文

  • 发表日期：

    2026年3月26日

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  • Yaru Wang,
  • Chang Zhou,
  • Xin Liu,
  • Yilin Fan,
  • Hongchao Mu,
  • Jiankang Wang,
  • Junfeng Li,
  • Pu Wang

摘要

The riverine riparian zone, as a transitional area connecting the soil and the river, serves as a barometer reflecting the quality of both the soil and the river. As a typical irrigation-dependent agricultural region in arid northwest China, the Kuitun River Basin relies on healthy soils to sustain agricultural productivity and maintain ecological stability. This study investigated seven potentially toxic elements (PTEs: As, Cd, Cr, Cu, Ni, Pb, Zn) in 25 riparian soil samples, using inductively coupled plasma mass spectrometry (ICP-MS) for analysis. Geo-accumulation index (Igeo), potential ecological risk index (RI), and the USEPA health risk model were applied for risk assessment, with Pearson correlation and principal component analysis (PCA) for source identification. Results showed the soils were severely saline-alkaline (average sodium adsorption ratio = 38.05, > 13). The concentration of PTEs in the soils were basically consistent with the local background value in Xinjiang. Meanwhile, the ecological risks posed by PTEs were also generally within the safe threshold range based on the geo-accumulation index and potential ecological risk index. However, the areas closed to the urban river basins showed relatively high levels of Cd and Ni pollution(Igeo grades 4–5 for Ni at partial sites). Furthermore, both the non-carcinogenic risk and carcinogenic risk caused by PTEs were under the safety threshold. But, the contribution of Cr to the risk to human health accounts for 96.8%, acting as a threat to ecological safety, which needs further attention by local government.