State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210023, China.
Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education, Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou 510006, China.
J Hazard Mater. 2024 Jan 15;462:132770. doi: 10.1016/j.jhazmat.2023.132770. Epub 2023 Oct 12.
Nanomaterial application in agriculture offers novel solutions for soil arsenic (As) pollution control, yet safety along the food chain is of concern. We comprehensively assessed CeO nanoparticles (NPs) foliar application effects on As uptake by pakchoi and their presence in the pakchoi-snail food chain. CeO NPs reduced As transfer from pakchoi roots to shoots by 37.9%, lowered As in snail foot by 39%, and halved human As exposure risk. The NPs alleviated pakchoi shoot As toxicity by regulating antioxidants, enhancing water use efficiency, and photosynthesis. CeO +As treatment raised GSH/GSSG ratios by 38.92%- 167.54%, leading to an increased As/As ratio and inorganic As detoxification compared to As alone. Metabolomics revealed CeO's rapid As response via phosphatidylinositol signaling. The enzyme-like activity of CeO NPs may drive these effects. While CeO foliar application accumulated Ce on pakchoi leaves, > 99% of Ce was excreted following snail consumption. Ce transfer from pakchoi leaves to snail foot was minimal (trophic transfer factor ∼0.00007) due to limited bioavailability. The target hazard quotient of Ce in pakchoi shoot (1.21 ± 0.18) and snails (0.0016 ± 0.0004) indicated low exposure risk, suggesting a 'risk filter' effect for CeO. Our results contribute to the safe and sustainable application of CeO NPs in the future implication.
纳米材料在农业中的应用为土壤砷（As）污染控制提供了新的解决方案，但沿食物链的安全性令人担忧。我们全面评估了 CeO 纳米颗粒（NPs）叶面应用对小白菜吸收 As 的影响及其在小白菜-蜗牛食物链中的存在。CeO NPs 将 As 从小白菜根部向茎叶的转移减少了 37.9%，降低了蜗牛足部的 As 含量 39%，将人类接触 As 的风险降低了一半。纳米颗粒通过调节抗氧化剂、提高水利用效率和光合作用缓解了小白菜茎叶中的 As 毒性。CeO+As 处理将 GSH/GSSG 比值提高了 38.92%-167.54%，与单独的 As 相比，增加了 As/As 比值和无机 As 的解毒作用。代谢组学揭示了 CeO 通过磷脂酰肌醇信号对 As 的快速响应。CeO NPs 的酶样活性可能导致了这些影响。虽然 CeO 叶面应用使 Ce 在小白菜叶片上积累，但蜗牛食用后超过 99%的 Ce 被排出。由于生物利用度有限，Ce 从小白菜叶片向蜗牛足部的转移很小（营养传递系数约为 0.00007）。小白菜茎叶（1.21±0.18）和蜗牛（0.0016±0.0004）中 Ce 的目标危害商数表明暴露风险低，这表明 CeO 具有“风险过滤”效应。我们的研究结果为未来 CeO NPs 的安全和可持续应用提供了依据。
