Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, Republic of Tatarstan 420008, Russian Federation.
Institute of Fundamental Medicine and Biology, Kazan Federal University, Kreml uramı 18, Kazan, Republic of Tatarstan 420008, Russian Federation.
Sci Total Environ. 2023 Jan 1;854:158574. doi: 10.1016/j.scitotenv.2022.158574. Epub 2022 Sep 6.
The high worldwide consumption of cheap plastic goods has already resulted in a serious environmental plastic pollution, exacerbated by piling of disposed personal protective equipment because of the recent outbreak of COVID-19. The aim of this study was to assess the feasibility of dark-field hyperspectral microscopy in the 400-1000 wavelength range for detection of nanoplastics derived from weathered polypropylene masks. A surgical mask was separated to layers and exposed to UV radiation (254 nm) for 192 h. Oxidative degradation of the polypropylene was evidenced by ATR FT-IR analysis. UV treatment for 192 h resulted in generation of differently shaped micro- and nano-sized particles, visualized by dark-field microscopy. The presence of nanoparticles was confirmed by AFM studies. The hyperspectral profiles (400-1000 nm) were collected after every 48 h of the UV treatment. The distinct hyperspectral features faded after prolonged UV exposure, but the assignment of some particles to either blue or white layers of mask could still be made based on spectral characteristics.
由于 COVID-19 的爆发，大量被丢弃的个人防护设备堆积如山，这使得全世界对廉价塑料产品的高消耗已经导致了严重的环境塑料污染。本研究旨在评估在 400-1000 波长范围内使用暗场高光谱显微镜检测源自风化聚丙烯口罩的纳米塑料的可行性。将一个外科口罩分离成几个层，并将其暴露在 254nm 的 UV 辐射下 192 小时。ATR-FTIR 分析表明聚丙烯发生了氧化降解。经过 192 小时的 UV 处理，生成了不同形状的微纳米级颗粒，可以通过暗场显微镜观察到。AFM 研究证实了纳米颗粒的存在。在 UV 处理后的每 48 小时收集一次高光谱谱（400-1000nm）。经过长时间的 UV 暴露后，明显的高光谱特征消失了，但仍可以根据光谱特征将一些颗粒分配到口罩的蓝色或白色层上。
