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裂形态是否决定了垃圾填埋塑料中的PFAS吸收?
Md Tanbir Khan1, Himani Yadav1, Hua Deng2
1Department of Civil, Construction and Environmental Engineering, North Dakota State University, Fargo, ND 58102, United States.
Journal of hazardous materials
|January 25, 2026
概括
塑料裂形态不会显著影响垃圾填埋场中的和多甲基物质 (PFAS) 吸附. 软塑料,如LDPE,由于分区类型的吸附而不是表面裂,比硬塑料积累了更多的PFAS.
科学领域:
- 环境科学 环境科学
- 聚合物科学 聚合物科学
- 分析化学 分析化学
背景情况:
- 垃圾填埋塑料经历老化和表面裂纹.
- 裂形态在per-和多基物质 (PFAS) 吸附中的作用仍然不清楚.
- 了解垃圾填埋场中的PFAS命运对于环境风险评估至关重要.
研究的目的:
- 研究塑料裂形态与垃圾填埋条件下的PFAS吸附之间的关系.
- 为了比较硬塑料与软塑料中的PFAS吸附.
- 为了阐明PFAS在填埋塑料中的保留机制.
主要方法:
- 来自垃圾填埋场的55个硬 (HDPE,PP,PET,PS,PVC) 和19个软 (LDPE) 塑料样品的特征.
- 表面裂纹图案 (线,曲线,网络) 的分类和密度测量.
- 使用EPA方法1633量化PFAS,并分析吸附的有机碳.
主要成果:
- 硬塑料的裂密度随着深度的增加而增加,而软塑料没有明显的裂.
- 与硬塑料 (1.7-16.8μg/kg) 相比,软塑料 (LDPE) 的PFAS负载 (45.9-309.9μg/kg) 显著更高.
- 裂纹密度与硬塑料中的PFAS吸附没有相关性;有机掩盖有限的聚合物-PFAS相互作用.
结论:
- 由聚合物自由体积驱动的分离式吸附是PFAS在塑料中保留的主要机制.
- 软塑料是PFAS在垃圾填埋场中的重要积累热点.
- 在现实的垃圾填埋条件下,表面裂纹在PFAS吸附中起到最小的作用,其被有机掩盖等其他因素所掩盖.
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