(微) 塑料拉曼光谱的挑战:着色剂的干扰作用
Aala Azari1, Steven Ronsmans1, Jeroen A J Vanoirbeek1
1Environment and Health, Department of Public Health and Primary Care, KU Leuven, Herestraat 49, 3000, Leuven, Belgium.
Environmental pollution (Barking, Essex : 1987)
|November 11, 2024
概括
拉曼光谱因色素干扰而难以识别有色的微塑料. 标准处理不能提高准确性,突出需要先进的方法可靠的微塑料分析.
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:
- 微塑料 (MP) 污染是一个日益严重的环境问题.
- 拉曼光谱是MP识别的关键技术,即使对于小到1微米的粒子.
- 塑料中的染料和添加剂可能会干扰拉曼光谱分析,降低识别精度.
研究的目的:
- 评估拉曼微光谱仪用于识别彩色塑料样品的准确性.
- 评估氧化处理在减轻着色剂干扰方面的有效性.
- 确定添加剂对基于拉曼的聚合物识别的影响.
主要方法:
- 使用拉曼成像显微镜分析标准和彩色的微塑料.
- 氧化处理 (H2O2,甲,芬顿试剂) 的应用在有色塑料上,持续时间不同 (24,48,72小时).
- 获取和比较治疗前后的拉曼光谱,以评估聚合物识别的准确性.
主要成果:
- 染料,特别是红色颜料,显著干扰拉曼光谱,导致峰值扩大和光,从而降低识别精度.
- 氧化处理和芬顿试剂在消除着色剂干扰方面表现出有限的有效性.
- 塑料样本中的添加剂对拉曼光谱用于聚合物识别的可靠性产生负面影响.
结论:
- 目前常见的处理程序不能提高基于拉曼的微塑料识别的准确性.
- 提高拉曼分析的可靠性需要先进的策略.
- 推的策略包括使用多重激发激光,适当的CCD探测器,对着色剂/添加剂的全面参考库,以及使用时间隔离的拉曼光谱或表面增强的拉曼光谱 (SERS) 等先进技术.
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