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Background&#xa0;Aims and Methods <p>This study uses a rapidly urbanizing urban agglomeration as a case to quantify the impact of key influencing factors (chemical weathering, geochemical processes, and human activities) on heavy metal(loid) concentration and bioavailability, providing scientific support for soil pollution control.</p> Results <p>Non–ferrous metal and Pb–Cd industries (e.g., batteries, electroplating, automobile exhaust emissions) serve as the primary anthropogenic sources for As, Cd, Cu, Hg, Pb, and Zn enrichment in soils, with contribution rates of 31–58%. As a key natural process, weathering not only significantly influences Cd, Cr, Ni, and Pb concentrations (10–21%), but also notably influence the bioavailability of As, Hg and Ni. Besides, Organic geochemical processes notably enhance the bioavailability of Cd and Pb, and soil pH and geological parent rocks universally suppress the bioavailability of heavy metal(loid)s except for Cr (with geological parent rocks having a non-significant impact on Pb).</p> Conclusion <p>The synergistic use of diverse statistical methodologies enables the effective pinpointing of key factors governing the enrichment and activation of heavy metal(loid)s within regional environmental contexts. Notably, in subtropical zones, weathering processes and organic geochemical processes wield a significant and undeniable influence on the bioavailability dynamics of heavy metal(loid)s. Therefore, it is imperative that the ramifications of weathering and organic geochemical processes be comprehensively accounted for in forthcoming soil pollution evaluation and remediation planning.</p>

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Quantifying heavy metal(loid)s sources in subtropical soils and assessing key determinants of their bioavailability: insights from the Yangtze River Delta, China

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Minqi Shi,
  • Cheng Wang,
  • Jianhua Wang,
  • Cong Zhong,
  • Yanping Zhao

摘要

Background Aims and Methods

This study uses a rapidly urbanizing urban agglomeration as a case to quantify the impact of key influencing factors (chemical weathering, geochemical processes, and human activities) on heavy metal(loid) concentration and bioavailability, providing scientific support for soil pollution control.

Results

Non–ferrous metal and Pb–Cd industries (e.g., batteries, electroplating, automobile exhaust emissions) serve as the primary anthropogenic sources for As, Cd, Cu, Hg, Pb, and Zn enrichment in soils, with contribution rates of 31–58%. As a key natural process, weathering not only significantly influences Cd, Cr, Ni, and Pb concentrations (10–21%), but also notably influence the bioavailability of As, Hg and Ni. Besides, Organic geochemical processes notably enhance the bioavailability of Cd and Pb, and soil pH and geological parent rocks universally suppress the bioavailability of heavy metal(loid)s except for Cr (with geological parent rocks having a non-significant impact on Pb).

Conclusion

The synergistic use of diverse statistical methodologies enables the effective pinpointing of key factors governing the enrichment and activation of heavy metal(loid)s within regional environmental contexts. Notably, in subtropical zones, weathering processes and organic geochemical processes wield a significant and undeniable influence on the bioavailability dynamics of heavy metal(loid)s. Therefore, it is imperative that the ramifications of weathering and organic geochemical processes be comprehensively accounted for in forthcoming soil pollution evaluation and remediation planning.