Scholarlink

Purpose <p>The co-occurrence of cadmium contamination and selenium deficiency in agricultural soils threatens crop safety and nutritional quality. Conventional amendments often lack the ability to simultaneously immobilize Cd and enhance Se bioavailability. This study aimed to develop and evaluate ultra-high temperature (1000&#xa0;°C) modified minerals—wollastonite (Wo), dolomite (Dol), and kaolin (Kln)—for their efficacy in regulating Cd and Se mobility and accumulation in a soil-lettuce system.</p> Materials and methods <p>Pristine wollastonite, dolomite, and kaolin were modified at 1000&#xa0;°C. A pot experiment was conducted with Cd-contaminated and Se-deficient soil. The thermally modified minerals were applied, and lettuce was cultivated. Post-harvest analyses included soil pH, bioavailable Cd and Se concentrations (DTPA-extractable), and the corresponding Cd and Se contents, along with biomass, in lettuce plants.</p> Results and discussion <p>Thermally modified wollastonite was the most effective amendment. It significantly increased soil pH by 2.52 units, decreased bioavailable Cd by 43.50%, and increased bioavailable Se by 151.13%. Consequently, lettuce Cd accumulation decreased by 62.73%, while Se content and dry weight increased by 37.89% and 63.24%, respectively. Thermally modified dolomite also reduced bioavailable Cd (43.78%) but its excessive alkalinity inhibited lettuce growth (20.59% dry weight reduction). Kaolin was ineffective. The thermally modified wollastonite likely immobilizes Cd and mobilizes Se via increased pH and released silicon, which alleviates Cd toxicity and promotes plant growth.</p> Conclusions <p>Ultra-high temperature modified wollastonite successfully achieves the synergistic goals of Cd immobilization, Se biofortification, and yield enhancement in lettuce, offering a highly effective strategy for the safe and nutritious production of crops in co-contaminated farmland. The contrasting performance of the minerals underscores the importance of selecting appropriate amendment materials based on their specific physicochemical properties.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Thermally modified minerals for synergistic regulation of cadmium and selenium and their performance in lettuce

  • 期刊论文

  • 发表日期：

    2026年3月25日

查看全文
  • Juan Zhang,
  • Ronghua Xu,
  • Hongyu Jiang,
  • Changyu Xie,
  • Yuan Gao

摘要

Purpose

The co-occurrence of cadmium contamination and selenium deficiency in agricultural soils threatens crop safety and nutritional quality. Conventional amendments often lack the ability to simultaneously immobilize Cd and enhance Se bioavailability. This study aimed to develop and evaluate ultra-high temperature (1000 °C) modified minerals—wollastonite (Wo), dolomite (Dol), and kaolin (Kln)—for their efficacy in regulating Cd and Se mobility and accumulation in a soil-lettuce system.

Materials and methods

Pristine wollastonite, dolomite, and kaolin were modified at 1000 °C. A pot experiment was conducted with Cd-contaminated and Se-deficient soil. The thermally modified minerals were applied, and lettuce was cultivated. Post-harvest analyses included soil pH, bioavailable Cd and Se concentrations (DTPA-extractable), and the corresponding Cd and Se contents, along with biomass, in lettuce plants.

Results and discussion

Thermally modified wollastonite was the most effective amendment. It significantly increased soil pH by 2.52 units, decreased bioavailable Cd by 43.50%, and increased bioavailable Se by 151.13%. Consequently, lettuce Cd accumulation decreased by 62.73%, while Se content and dry weight increased by 37.89% and 63.24%, respectively. Thermally modified dolomite also reduced bioavailable Cd (43.78%) but its excessive alkalinity inhibited lettuce growth (20.59% dry weight reduction). Kaolin was ineffective. The thermally modified wollastonite likely immobilizes Cd and mobilizes Se via increased pH and released silicon, which alleviates Cd toxicity and promotes plant growth.

Conclusions

Ultra-high temperature modified wollastonite successfully achieves the synergistic goals of Cd immobilization, Se biofortification, and yield enhancement in lettuce, offering a highly effective strategy for the safe and nutritious production of crops in co-contaminated farmland. The contrasting performance of the minerals underscores the importance of selecting appropriate amendment materials based on their specific physicochemical properties.