An Qirui, Zheng Na, Chen Changcheng, Li Xiaoqian, Ji Yining, Peng Liyuan, Xiu Zhifei, Lin Qiuyan
Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, China; Jilin Provincial Key Laboratory of Water Resources and Water Environment, Jilin University, China.
Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of New Energy and Environment, Jilin University, China; Jilin Provincial Key Laboratory of Water Resources and Water Environment, Jilin University, China.
J Hazard Mater. 2025 May 5;488:137505. doi: 10.1016/j.jhazmat.2025.137505. Epub 2025 Feb 4.
It is still unclear whether there are differences in the effects of microplastics with different particle sizes on the environmental behavior of cadmium (Cd) in the soil-crop system. By introducing the polystyrene microplastics (PS-MPs) with 0.2, 2, and 20 μm, this study explored the regulation strategies of different-sized MPs on the migration and toxicity of Cd in the soil-pakchoi system. Compared to the Cd treatment, the mobility factor of Cd in the soil decreased by 12.97 %, 34.73 %, and 40.12 % with increasing particle sizes of PS-MPs, while the relative binding intensity increased significantly. The 0.2 μm PS-MPs had no effect on Cd content in pakchoi, however, 2 and 20 μm PS-MPs significantly reduced the Cd content in shoots and roots of pakchoi by 47.40 %-29.67 % and 44.56 %-20.92 %, respectively. Additionally, 20 μm PS-MPs reduced the enrichment of the heavy Cd isotope in pakchoi. The results of principal component analysis (PCA) and structural equation modeling (SEM) indicated that 2 and 20 μm PS-MPs may promote the growth of pakchoi by regulating soil properties, nutrient uptake, Cd accumulation, and antioxidant system activity. This study provides evidence for the importance of particle size of MPs in regulating the environmental behavior of heavy metals.
不同粒径的微塑料对土壤-作物系统中镉（Cd）环境行为的影响是否存在差异仍不清楚。通过引入粒径为0.2、2和20μm的聚苯乙烯微塑料（PS-MPs），本研究探讨了不同粒径微塑料对土壤-小白菜系统中Cd迁移和毒性的调控策略。与Cd处理相比，随着PS-MPs粒径增大，土壤中Cd的迁移因子分别降低了12.97%、34.73%和40.12%，而相对结合强度显著增加。0.2μm的PS-MPs对小白菜中Cd含量没有影响，然而，2μm和20μm的PS-MPs分别使小白菜地上部和根部的Cd含量显著降低了47.40%-29.67%和44.56%-20.92%。此外，20μm的PS-MPs降低了小白菜中重Cd同位素的富集。主成分分析（PCA）和结构方程模型（SEM）结果表明，2μm和20μm的PS-MPs可能通过调节土壤性质、养分吸收、Cd积累和抗氧化系统活性来促进小白菜生长。本研究为微塑料粒径在调节重金属环境行为中的重要性提供了证据。
