拉曼成像用于分析从厨房密封剂释放的微塑料和纳米塑料
Cheng Fang1,2, Yunlong Luo1, Ravi Naidu1,2
1Global Centre for Environmental Remediation (GCER), University of Newcastle, Callaghan, NSW, Australia.
Frontiers in chemistry
|June 2, 2023
概括
厨房密封剂释放出大量的微塑料和纳米塑料. 先进的拉曼成像有效地检测到这些微小的塑料颗粒,即使比激光更小.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
背景情况:
- 无处不在的塑料制品可以将微塑料和纳米塑料释放到环境中.
- 在厨房中常见的密封剂是这些新出现的污染物的潜在来源.
- 对微塑料和纳米塑料的有效监测方法至关重要.
研究的目的:
- 开发和验证一种先进的拉曼成像技术,用于表征微塑料和纳米塑料.
- 评估厨房密封剂中微塑料和纳米塑料的释放情况.
- 改进纳米塑料颗粒分析的检测极限和分辨率.
主要方法:
- 利用先进的拉曼成像与扫描光谱矩阵来分析数百种光谱.
- 将扫描像素大小减少到大约50nm,以提高纳米塑料的成像分辨率.
- 开发了图像重建算法,以改善信号噪声比,并隔离有意义的拉曼信号.
主要成果:
- 通过对光谱矩阵的统计分析,证明了显著增加的信号噪声比.
- 成功成像的纳米塑料小于激光衍射极限 (∼300 nm).
- 确认厨房密封剂释放大量的微塑料和纳米塑料.
结论:
- 先进的拉曼成像,加上图像重建,为检测和表征微塑料和纳米塑料提供了一种有效的方法.
- 这种技术可以识别离散极限以下的塑料颗粒,为环境监测提供了新的可能性.
- 密封剂是微塑料和纳米塑料污染的重要环境来源.
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