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Calcareous Materials Effectively Reduce the Accumulation of Cd in Potatoes in Acidic Cadmium-Contaminated Farmland Soils in Mining Areas

Author

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  • Sitong Gong

    (Guizhou University, Guiyang 550025, China)

  • Hu Wang

    (Guizhou Chuyang Ecological Environmental Protection Technology Co., Ltd., Guiyang 550025, China)

  • Fei Lou

    (Guizhou University, Guiyang 550025, China)

  • Ran Qin

    (Guizhou University, Guiyang 550025, China)

  • Tianling Fu

    (Guizhou University, Guiyang 550025, China)

Abstract

The in situ chemical immobilization method reduces the activity of heavy metals in soil by adding chemical amendments. It is widely used in farmland soil with moderate and mild heavy metal pollution due to its high efficiency and economy. However, the effects of different materials depend heavily on environmental factors such as soil texture, properties, and pollution levels. Under the influence of lead–zinc ore smelting and soil acidification, Cd is enriched and highly activated in the soils of northwestern Guizhou, China. Potato is an important economic crop in this region, and its absorption of Cd depends on the availability of Cd in the soil and the distribution of Cd within the plant. In this study, pot experiments were used to compare the effects of lime (LM), apatite (AP), calcite (CA), sepiolite (SP), bentonite (BN), and biochar (BC) on Cd accumulation in potatoes. The results showed that the application of LM (0.4%), AP (1.4%), and CA (0.4%) had a positive effect on soil pH and cations, and that they effectively reduced the availability of Cd in the soil. In contrast, the application of SP, BN, and BC had no significant effect on the soil properties and Cd availability. LM, AP, and CA treatment strongly reduced Cd accumulation in the potato tubers by controlling the total ‘flux’ of Cd into the potato plants. In contrast, the application of SP and BN promoted the migration of Cd from the root to the shoot, while the effect of BC varied by potato genotype. Overall, calcareous materials (LM, CA, and AP) were more applicable in the remediation of Cd-contaminated soils in the study area.

Suggested Citation

  • Sitong Gong & Hu Wang & Fei Lou & Ran Qin & Tianling Fu, 2022. "Calcareous Materials Effectively Reduce the Accumulation of Cd in Potatoes in Acidic Cadmium-Contaminated Farmland Soils in Mining Areas," IJERPH, MDPI, vol. 19(18), pages 1-14, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:18:p:11736-:d:917511
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    References listed on IDEAS

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    1. Tingting Wu & Xiangyang Bi & Zhonggen Li & Guangyi Sun & Xinbin Feng & Lihai Shang & Hua Zhang & Tianrong He & Ji Chen, 2017. "Contaminations, Sources, and Health Risks of Trace Metal(loid)s in Street Dust of a Small City Impacted by Artisanal Zn Smelting Activities," IJERPH, MDPI, vol. 14(9), pages 1-19, August.
    2. Qiyu Dong & Jianbo Fang & Fei Huang & Kunzheng Cai, 2019. "Silicon Amendment Reduces Soil Cd Availability and Cd Uptake of Two Pennisetum Species," IJERPH, MDPI, vol. 16(9), pages 1-13, May.
    3. Rongkui Su & Qiqi Ou & Hanqing Wang & Yiting Luo & Xiangrong Dai & Yangyang Wang & Yonghua Chen & Lei Shi, 2022. "Comparison of Phytoremediation Potential of Nerium indicum with Inorganic Modifier Calcium Carbonate and Organic Modifier Mushroom Residue to Lead–Zinc Tailings," IJERPH, MDPI, vol. 19(16), pages 1-15, August.
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