基于自组织地图和多形状描述符的海塑料碎片轮的细分:快速指示碎片化和磨损类型
Lei Su1, Xinyue Dong2, Junjie Peng2
1College of Oceanography and Ecological Science, Shanghai Ocean University, Shanghai 201306, China; State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China.
Journal of hazardous materials
|August 22, 2024
概括
塑料碎片在碎片化过程中表现出同度现象,其中轮复杂性和圆形变化与尺寸有关. 这项研究开发了一种方法,以高精度区分环境和人工塑料碎片.
科学领域:
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
背景情况:
- 环境塑料碎片,包括微塑料和纳米塑料,是重要的二次污染物.
- 对塑料碎片的气候变化机制的定量研究是有限的.
- 碎片的轮特征为气候变化过程提供了有价值的见解.
研究的目的:
- 开发一种用于对塑料碎片轮进行分类的方法框架.
- 调查碎片大小和轮特征 (圆形,复杂性) 之间的关系.
- 为了区分环境和人工塑料样品.
主要方法:
- 现场和人工聚乙烯/聚烯样品的表征使用几何描述符,碎形维度和富里埃描述符.
- 使用具有尺寸不变参数的自我组织神经网络进行无监督分类.
- 使用碳基指数测量进行验证.
主要成果:
- 识别一个同度现象:轮圆形增加,而复杂性减少随着碎片大小的减少.
- 成功区分人工和现场样本,平均错误率为8.9%.
- 提出了两阶段的塑料碎片化过程,并确定了关键的轮特征 (大小,复杂性,圆形).
结论:
- 开发的轮分析框架准确地描述了塑料碎片的风化和碎片化.
- 轮参数提供了一种可靠的方法来区分环境和人造塑料碎片.
- 该方法有可能应用于各种聚合物和现实的环境场景.
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