Abstract

Uses of iron oxide nanoparticles have increased in the last decade. The increased application marked a concern regarding their fate and behavior in the environment. Especially towards the aquatic ecosystems, as the ultimate descend of these iron oxide nanoparticles are aquatic bodies. The greater surface area per mass compared with larger-sized materials of the same chemistry renders these nanoparticles biologically more active. Therefore, it is imperative to assess their eco-toxicogical impact on aquatic eco-systems. In the present study, comparative assessment of iron oxide nanoparticles and their bulk counterpart have been monitored using Coelastrella terrestris up to 40 days. Interestingly, study reveals the potential of Coelastrella terrestris as tool for the bioremediation of iron nanoparticles to combat nano-pollution. Adsorption/absorption kinetics measured after 25 days of treatments with iron oxide nanoparticle and its bulk counterpart revealed higher absorption levels in comparison to the adsorption with maximum accumulation factor (AF) of 2.984 at 50 mg L⁻¹ in nano-form. Iron oxide absorption was found linearly related with concentration in both cases (y = 11.313x-12.165, R² = 0.8691 in nano; y = 6.35x-5.74, R² = 0.8128 in bulk). However, 50-mg L⁻¹ nanoparticle concentration was perceived sub-lethal for the algae with 33.33% algal growth reduction under nano and 27.77% under bulk counterpart. Other biochemical parameters, i.e., SOD, CAT, MDA, and lipid quantification, were also quantified to correlate the state of metabolism of treated algal cells in comparison to the control and these exhibited reduction in algal growth due to oxidative stress. Morphological changes were monitored through SEM and TEM.

中文翻译：

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氧化性铁纳米颗粒的毒性评估和微藻类ela藜的积聚。

摘要

在最近十年中，氧化铁纳米粒子的使用有所增加。越来越多的应用程序表明了他们在环境中的命运和行为的担忧。尤其是对水生生态系统而言，随着这些氧化铁纳米粒子的最终衰落，水生生物得以生存。与相同化学性质的较大尺寸的材料相比，每质量的表面积更大，使这些纳米粒子具有更高的生物活性。因此，必须评估它们对水生生态系统的生态毒理学影响。在目前的研究中，氧化铁纳米颗粒及其大量对应物的比较评估已使用大肠腔肠杆菌进行了长达40天的监测。有趣的是，研究揭示了冠心菌的潜力作为铁纳米颗粒的生物修复以对抗纳米污染的工具。与在纳米形式的50 mg L ^-1的最大累积因子（AF）为2.984的吸附相比，用氧化铁纳米颗粒及其主体吸附剂处理25天后测得的吸附/吸收动力学显示出更高的吸收水平。在两种情况下，发现氧化铁吸收与浓度成线性关系（y =  11.313x-12.165，R ²  =  0.8691（纳米）；y =  6.35x-5.74，R ²  =  0.8128体积）。但是，50 mg L ^-1纳米藻的纳米颗粒浓度被认为是亚致命的，纳米级的藻类生长减少了33.33％，而大型藻类的则降低了27.77％。与对照相比，还定量了其他生化参数，即SOD，CAT，MDA和脂质定量，以关联处理过的藻类细胞的代谢状态，这些参数由于氧化应激而显示藻类生长减少。通过SEM和TEM监测形态变化。