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<p>This study assessed the potential of organic and inorganic soil amendments to reduce arsenic (As) and heavy metals (Pb, Zn, Cu, Cd) mobility and uptake by crops in contaminated agricultural soils. A pot experiment was conducted using biochar and a limestone–steel slag mixture (LSM) as stabilizing agents, with lettuce (<i>Lactuca sativa</i> L.) and young radish (<i>Raphanus sativus var. longipinnatus</i>) as test crops. The stabilization effects were evaluated by measuring 0.1 N HCl-extractable metal fractions in soil and the elemental concentrations in edible plant tissues. LSM treatments significantly lowered the bioavailable concentrations of As and heavy metals in surface soil, and also led to reduced accumulation in plant tissues compared to the biochar treatments. Notably, Pb concentrations in both crops fell below the regulatory limit under the 5% LSM application. Biochar showed limited stabilization performance, possibly due to feedstock selection and production process. Crop growth was improved under LSM treatment, likely due to reduced metal toxicity in the rhizosphere. These findings demonstrate that LSM is a promising stabilizer for reducing metal mobility and crop uptake in contaminated soils.</p>

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Effects of organic and inorganic stabilizer amendments on arsenic and heavy metal transfer to lettuce and young radish in contaminated soil

  • 期刊论文

  • 发表日期：

    2025年10月28日

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  • Hui-Yeon Kim,
  • Yejin Choi,
  • Jong-Un Lee

摘要

This study assessed the potential of organic and inorganic soil amendments to reduce arsenic (As) and heavy metals (Pb, Zn, Cu, Cd) mobility and uptake by crops in contaminated agricultural soils. A pot experiment was conducted using biochar and a limestone–steel slag mixture (LSM) as stabilizing agents, with lettuce (Lactuca sativa L.) and young radish (Raphanus sativus var. longipinnatus) as test crops. The stabilization effects were evaluated by measuring 0.1 N HCl-extractable metal fractions in soil and the elemental concentrations in edible plant tissues. LSM treatments significantly lowered the bioavailable concentrations of As and heavy metals in surface soil, and also led to reduced accumulation in plant tissues compared to the biochar treatments. Notably, Pb concentrations in both crops fell below the regulatory limit under the 5% LSM application. Biochar showed limited stabilization performance, possibly due to feedstock selection and production process. Crop growth was improved under LSM treatment, likely due to reduced metal toxicity in the rhizosphere. These findings demonstrate that LSM is a promising stabilizer for reducing metal mobility and crop uptake in contaminated soils.