使用量子级联激光红外光谱仪确定空气中的微塑料的可靠方法
Adrián López-Rosales1, Borja Ferreiro1, José Andrade1
1Group of Applied Analytical Chemistry, University Institute of Environment, Universidade da Coruña, Campus da Zapateira s/n, E-15071 A Coruña, Spain.
The Science of the total environment
|December 30, 2023
概括
一种新方法有效地采样和表征空气中的微塑料 (MPs),使用被动装置和氧化消化. 这种方法量化了MP沉积率和郊区的聚合物类型.
科学领域:
- 环境科学 环境科学
- 分析化学 分析化学
- 大气科学 大气科学
背景情况:
- 对空气中的微塑料 (MPs) 的不断增长的研究强调了对标准化采样和分析方法的需求.
- 目前用于空中MP检测的技术在一致性和效率方面面临挑战.
研究的目的:
- 开发和验证一种快速,可靠的方法来表征空气中的微塑料.
- 为了优化大气中的散装沉积的采样和消化技术.
- 在郊区环境中评估空气中的MP沉积率和聚合物组成.
主要方法:
- 两种被动采样设备用于收集潮湿和干燥的大气沉积物.
- 使用KOH和NaClO的性氧化消化被优化为轻度有机基质去除.
- 采用了基于激光的高通量红外线 (LDIR) 装置,其粒子/纤维差异化和光谱匹配的参数经过了优化.
主要成果:
- 优化的性氧化方法显示了对颗粒 (82-90%) 和纤维 (62-73%) 的良好的过程分析回收.
- LDIR装置在纤维与颗粒的区分方面取得了>90%的成功,并使用匹配指数>0.85进行积极的光谱识别.
- 西北西班牙的空气微塑料沉积率在98-1220 MP/m2/day之间,其中聚乙烯 (PE),聚烯 (PP) 和聚乙烯四甲酸 (PET) 是最常见的聚合物.
结论:
- 开发的方法为空气中的微塑料分析提供了一种标准化和高效的方法.
- 空气中的微塑料构成了很小的一小部分 (约. 总大气颗粒的1.7%,颗粒和纤维的尺寸分布不同.
- 该研究提供了关于郊区空气中的MP污染的关键数据,为环境监测和政策提供了信息.
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