Quantifying the Dynamics of Polystyrene Microplastics UV-Aging Process
Quantifying the Dynamics of Polystyrene Microplastics UV-Aging Process
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DOI：
10.1021/acs.estlett.1c00888
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发表时间：
2022-01-11
影响因子：
10.9
通讯作者：
Huang, Yuxiong
中科院分区：
文献类型：
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作者：
Liu, Ziyi;Zhu, Yanjie;Huang, Yuxiong
大量的塑料垃圾被释放到生态系统中，在环境老化过程中产生了大量的微塑料（MP）和纳米塑料（NP）。然而，颗粒大小和数量动态沿着老化过程尚未进行定量评估，这可能会极大地影响其命运和环境风险评估。我们应用单粒子电感耦合等离子体质谱（spICP-MS）定量分析了具有宽粒度范围（800 nm-5 μ m）的聚苯乙烯（PS）MP老化过程以及环境相关值（低至7.1 × 10（6）粒子/L）的粒子数浓度。我们研究了紫外光加速老化动力学的PS MPs，并揭示了大量的纳米/微米尺寸的PS MPs片段的产生。PS MP显示出快速的尺寸下降趋势，沿着老化过程，从5 μ m收缩到1 μ m。与此同时，PS MP颗粒数浓度增加了3倍。此外，原始PS MP可能会引起急性毒性的摄食行为，生长和生存，而老年人造成显着的慢性毒性的大型蚤的生殖抑制，无论是在环境相关的浓度。总体而言，该研究揭示并量化了老化过程中MP的粒度和浓度，这对于评估MP/NP的生态毒理学风险至关重要。
Massive amounts of plastic waste have been released into ecosystems, generating huge amounts of microplastics (MPs) and nanoplastics (NPs) during the environmental aging process. However, particle size and number dynamics along the aging process have not been quantitatively assessed, which can greatly influence their fate and environmental risk assessment. We applied single particle inductively coupled plasma mass spectroscopy (spICP-MS) to quantitatively analyze the polystyrene (PS) MPs aging process with a wide particle size range (800 nm-5 mu m) as well as particle number concentration at an environmentally relevant value (down to 7.1 x 10(6) particles/L). We investigated the UV-light accelerated aging dynamics of PS MPs and revealed the generation of large amounts of nano/microsize PS MPs fragments. PS MPs showed a rapid size downtrend along the aging process, shrinking from 5 to 1 mu m. At the same time, PS MPs particle number concentration increased 3 times. Furthermore, pristine PS MPs may induce acute toxicity in feeding behavior, growth, and survival, while aged ones caused marked chronic toxicity on the reproduction inhibition of Daphnia magna, both at environmentally relevant concentrations. Overall, the research uncovered and quantified MPs particle size and concentration during the aging process, which is essential to assessing ecotoxicological risks of MPs/NPs.