Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
Faculty of Engineering and Applied Science, University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
J Hazard Mater. 2023 Sep 5;457:131695. doi: 10.1016/j.jhazmat.2023.131695. Epub 2023 May 23.
The study on micro/nanoplastic pollution should embrace complexity. Here, we aim to develop an aquatic environmental system-based comprehensive assessment approach of micro/nanoplastic impacts (ACAM) to evaluate the effects of micro/nanoplastics on aquatic ecosystems from the global environmental change (GEC) and systematic perspective. A case study for freshwater systems in Saskatchewan, Canada was conducted to evaluate the comprehensive effects of multiple GEC factors (polystyrene-nanoplastics (PS-NPs), N, P, salinity, dissolved organic matter (DOM), pH, hardness) on Asterococcus superbus based on ten ecologically relevant endpoints. It is found that at the cellular level, PS-NPs and N had an antagonistic interaction on microalgal growth in the Saskatchewan freshwater ecosystem; at the molecular level, the PS-NP-induced changes in lipid composition in microalgae were regulated by P, DOM, and pH. The significance ranking of factor effects suggested that instead of PS-NPs pollution, the fluctuations in pH level, DOM and N concentrations should be paid attention to first in Saskatchewan. Under the combined impact of PS-NPs and other GEC factors, microalgae at station 14 (Qu'Appelle River near highway 56) might have the minimum growth rate with [-0.048, 0.094] d in Saskatchewan. These findings demonstrate the efficacy of the developed ACAM in a more comprehensive and context-specific assessment of MNP risks, providing new insight for the management of MNP pollution.
微/纳米塑料污染的研究应包含复杂性。在这里，我们旨在开发一种基于水生环境系统的微/纳米塑料影响综合评估方法（ACAM），从全球环境变化（GEC）和系统的角度评估微/纳米塑料对水生生态系统的影响。对加拿大萨斯喀彻温省的淡水系统进行了案例研究，以评估多种 GEC 因素（聚苯乙烯纳米塑料（PS-NPs）、N、P、盐度、溶解有机物（DOM）、pH 值、硬度）对 Asterococcus superbus 的综合影响，基于十个生态相关终点。结果发现，在细胞水平上，PS-NPs 和 N 对萨斯喀彻温省淡水生态系统中小藻的生长表现出拮抗作用；在分子水平上，PS-NP 诱导的微藻脂质组成变化受 P、DOM 和 pH 调节。因子效应的显著性排序表明，在萨斯喀彻温省，应首先关注 pH 值、DOM 和 N 浓度的波动，而不是 PS-NPs 污染。在 PS-NPs 和其他 GEC 因素的综合影响下，位于 14 号站（靠近 56 号高速公路的 Qu'Appelle 河）的藻类的生长速率最低，为 [-0.048, 0.094] d。这些发现证明了所开发的 ACAM 在更全面和特定背景下评估 MNP 风险的有效性，为 MNP 污染的管理提供了新的见解。
