<br>二氧化硅纳米颗粒尺寸决定了抑制大型溞吸收氧化铁纳米颗粒的机制,Environmental Science & Technology

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二氧化硅纳米颗粒尺寸决定了抑制大型溞吸收氧化铁纳米颗粒的机制
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-12-19 , DOI: 10.1021/acs.est.3c06997
Yue-Yue Liu _{1,

2} , Wei Pan ₁ , Mei Wang ₁ , Ke-Da Zhang ₁ , Hong-Jie Zhang ₁ , Bin Huang ₁ , Wei Zhang ₂ , Qiao-Guo Tan ₃ , Ai-Jun Miao ₁

Affiliation

水生环境是包含不同类型纳米颗粒 (NP) 的复杂系统。然而，最近关于纳米粒子毒性的研究，特别是那些关注生物蓄积性的研究大多只研究单一类型的纳米粒子。不考虑共同暴露制度的纳米粒子环境风险评估可能会导致不准确的结论和无效的环境监管。因此，本研究探讨了不同尺寸的二氧化硅纳米粒子（SiO ₂ NPs）对浮游动物大型水蚤吸收氧化铁纳米粒子（Fe ₂ O ₃ NPs）的影响。 SiO ₂ NPs和Fe ₂ O ₃ NPs在实验介质中均分散良好，没有明显的异质聚集。尽管所有三种尺寸的 SiO ₂ NP 都会抑制 Fe ₂ O ₃ NP 的吸收，但潜在的机制不同。小于D. magna过滤装置平均筛孔尺寸（~200 nm）的 SiO ₂ NP 通过摄取竞争减少 Fe ₂ O ₃ NP 的积累，而较大的 SiO ₂ NP 主要抑制 Fe ₂ O ₃ NP 的摄取通过降低水蚤的水过滤率。总体而言，在评估自然环境中纳米粒子的风险时，应考虑不同尺寸的纳米粒子对不同纳米粒子吸收影响的不同机制。

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Silica Nanoparticle Size Determines the Mechanisms Underlying the Inhibition of Iron Oxide Nanoparticle Uptake by Daphnia magna

Aquatic environments are complicated systems that contain different types of nanoparticles (NPs). Nevertheless, recent studies of NP toxicity, and especially those that have focused on bioaccumulation have mostly investigated only a single type of NPs. Assessments of the environmental risks of NPs that do not consider co-exposure regimes may lead to inaccurate conclusions and ineffective environmental regulation. Thus, the present study examined the effects of differently sized silica NPs (SiO₂ NPs) on the uptake of iron oxide NPs (Fe₂O₃ NPs) by the zooplankton Daphnia magna. Both SiO₂ NPs and Fe₂O₃ NPs were well dispersed in the experimental medium without significant heteroaggregation. Although all three sizes of SiO₂ NPs inhibited the uptake of Fe₂O₃ NPs, the underlying mechanisms differed. SiO₂ NPs smaller than the average mesh size (∼200 nm) of the filtering apparatus of D. magna reduced the accumulation of Fe₂O₃ NPs through uptake competition, whereas larger SiO₂ NPs inhibited the uptake of Fe₂O₃ NPs mainly by reducing the water filtration rate of the daphnids. Overall, in evaluations of the risks of NPs in the natural environment, the different mechanisms underlying the effects of NPs of different sizes on the uptake of dissimilar NPs should be considered.

更新日期：2023-12-19

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