Chen Dun, Xu Wenxuan, Cao Shenglai, Xia Yan, Du Wenchao, Yin Ying, Guo Hongyan
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Ningxia Hui Autonomous Region Coal Geology Bureau, Yinchuan, 750004, China.
Environ Sci Pollut Res Int. 2023 Jan;30(2):5231-5241. doi: 10.1007/s11356-022-22448-4. Epub 2022 Aug 18.
The reported biological effects of cerium dioxide nanoparticles (nCeO) in soils range from toxic to protective. However, divergences of nCeO toxicity in soils of different textures are not known. In this study, the availability of nCeO on earthworms (Eisenia fetida) in sandy loam soils and clay soils was discussed, and the biological effects of nCeO (0-1000 mg/kg) on earthworms in two soils were investigated. The results showed the bioaccumulation and biological effects of Ce on earthworms in the two soils were inconsistent. The European Community Bureau of Reference (BCR) sequential extraction revealed that the major portions of Ce in both soils were in the residual form (98-99%), and the acid-soluble Ce fraction was greater in clay soils. However, nCeO was more toxic to earthworms in sandy loam soils than that in clay soils as assessed by earthworm biomass, morphology, and antioxidative damage. Thus, the high ecological risk of nCeO in sandy loam soils with higher pH and lower clay contents needs to be avoided, being used in agriculture to improve both crop yield and quality.
据报道，二氧化铈纳米颗粒（nCeO）在土壤中的生物效应从有毒到具有保护作用不等。然而，不同质地土壤中nCeO毒性的差异尚不清楚。在本研究中，探讨了nCeO在砂壤土和粘土中对蚯蚓（赤子爱胜蚓）的有效性，并研究了nCeO（0 - 1000 mg/kg）对两种土壤中蚯蚓的生物效应。结果表明，两种土壤中铈对蚯蚓的生物累积和生物效应不一致。欧洲共同体标准物质局（BCR）连续提取法表明，两种土壤中铈的主要部分以残留形式存在（98 - 99%），且粘土中酸溶性铈部分含量更高。然而，通过蚯蚓生物量、形态和抗氧化损伤评估，nCeO对砂壤土中蚯蚓的毒性比对粘土中蚯蚓的毒性更大。因此，需要避免在pH值较高且粘土含量较低的砂壤土中使用nCeO，以防其用于农业以提高作物产量和品质时带来较高的生态风险。
