Quantifying impacts of titanium dioxide nanoparticles on natural assemblages of riverine phytobenthos and phytoplankton in an outdoor setting.
Quantifying impacts of titanium dioxide nanoparticles on natural assemblages of riverine phytobenthos and phytoplankton in an outdoor setting.
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量化二氧化钛纳米粒子对室外环境中河流底栖植物和浮游植物自然组合的影响。
DOI：
10.1016/j.scitotenv.2022.154616
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yallop M
中科院分区：
文献类型：
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作者：
Yallop M
广泛释放的工程二氧化钛纳米粒子（nTiO 2）对淡水浮游植物和植物底栖生物组合在外地的影响，代表了一个显着的知识差距。使用室外实验，我们量化的nTiO 2对浮游植物和附着生物从英国河流的影响，适用于代表环境现实的浓度（0.05毫克/升）和热点的积累（5.0毫克/升）的水平。此外，nTiO 2到河水中的nTiO 2与浮游植物的细胞，包括绿色藻类，羽状和中心硅藻，增加解决一些细胞的同质团聚体和许多异质聚集体的快速时间大小的变化。浮游植物组成的变化在72小时后是明显的，这是由于非常小的浮游植物细胞（1-3 μm）的相对丰度显著下降，通常伴随着两种浓度下中心硅藻的增加。12天后，nTiO 2处理后，在底栖植物的组成检测到显着的变化，不明显时，单独使用底栖硅藻56天后。缺乏抑制的最大量子产率（Fv/Fm）在底栖植物暴露72小时后，对比显着抑制Fv/Fm在75%的浮游植物样品，最高记录在金红石nTiO 2暴露在两个浓度的nTiO 2。12天后，强烈的正刺激响应记录在最大相对电子传递速率（rETRmax）和最大非光化学系数（NPQmax），在浮游植物和底栖植物样品暴露于较高的锐钛矿nTiO 2浓度，没有测量在金红石暴露生物区系。总的来说，这些结果表明，金红石相的nTiO 2有更多的负面影响，淡水藻类比锐钛矿的形式，在特定的时间尺度，浮游植物可能会受到更多的nTiO 2比底栖植物。我们警告说，重复释放nTiO 2，可能会导致显着的变化，在河流藻类生物量和物种组成，依赖于nTiO 2的阶段和浓度。
Impacts of widespread release of engineered titanium dioxide nanoparticles (nTiO2) on freshwater phytoplankton and phytobenthic assemblages in the field, represents a significant knowledge gap. Using outdoor experiments, we quantified impacts of nTiO2on phytoplankton and periphyton from UK rivers, applied at levels representative of environmentally realistic concentrations (0.05 mg/L) and hot spots of accumulation (5.0 mg/L). Addition of nTiO2to river water led to rapid temporal size changes in homoagglomerates and many heteroaggregates of nTiO2with cells in the phytoplankton, including green algae, pennate and centric diatoms, increasing settlement of some cells. Changes in phytoplankton composition were evident after 72-h resulting from a significant decline in the relative abundance of very small phytoplankton cells (1–3 μm), often accompanied by increases in centric diatoms at both concentrations. Significant changes detected in the composition of the phytobenthos after 12 days, following nTiO2treatments, were not evident when using benthic diatoms alone after 56 days. A lack of inhibition in the maximum quantum yield (Fv/Fm) in phytobenthos after 72-h exposures contrasted with a significant inhibition in Fv/Fm in 75% of phytoplankton samples, the highest recorded in Rutile nTiO2exposures at both concentrations of nTiO2. After 12 days, strong positive stimulatory responses were recorded in the maximum relative electron transport rate (rETRmax) and the maximum non-photochemical coefficient (NPQmax), in phytoplankton and phytobenthos samples exposed to the higher Anatase nTiO2concentration, were not measured in Rutile exposed biota. Collectively, these results indicate that the Rutile phase of nTiO2has more negative impacts on freshwater algae than the Anatase form, at specific time scales, and phytoplankton may be more impacted by nTiO2than phytobenthos. We caution that repeated release of nTiO2, could lead to significant changes in riverine algal biomass and species composition, dependent on the phase and concentration of nTiO2.