In-situ immobilization of cadmium-polluted upland soil: A ten-year field study

Ecotoxicology and Environmental Safety

Jiahua Li¹  Renzhang Lin²  Wenchao Du³  Fuxun Ai⁴  Ying Yin⁴  Xiaorong Wang⁴  Hongyan Guo⁴  Qingquan Zhang⁴  Guobing Wang, PH.D⁴  Rong Ji⁴ 

[1] Jiangsu Maritime Safety Administration, Nanjing, 210009, China;Penghu Town, Quanzhou City People's Government, Quanzhou, 362609, China;School of Environment, Nanjing Normal University, Nanjing, 210036, China;State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China;

关键词: Cadmium;    Soil;    Immobilization;    Long-term stability;   

DOI  :  

来源: DOAJ

【 摘 要 】

In-situ immobilization is an effective and economically viable strategy for remediation of soil extensively polluted with heavy metals. The long-term sustainability is critical for the remediation practice. In the present study, a ten-year experiment was performed in a Cd-polluted agricultural field to evaluate the long-term stability of lime, silicon fertilizer (SF), fused calcium magnesium phosphate fertilizer (FCMP), bone charcoal, steel slag, and blast furnace slag with one-off application. All amendments had no significant effect on biomass but significantly reduced Cd uptake by Artemisia selengensis at higher dose. Among them, SF and FCMP applied at 1% could reduce Cd uptake by more than 40% to meet the Chinese maximum permissible limit for Cd content in food products (50 μg kg−1). These amendments stimulated high Cd immobilization by increasing the soil pH and decreasing the soil acid-extractable Cd content, which were closely associated with Cd uptake. In addition, the two amendments altered the soil microbial structure and stimulated metabolism pathways, including amino acid, carbohydrate, and lipid metabolism, which are beneficial for soil function and quality. The results proved that SF and FCMP at 1% are stable and ecologically safe amendments, suitable for long-term Cd immobilization, and provide a strategy to mitigate the risk of food product contamination in heavy-metal-polluted soil.

【 授权许可】

Unknown