在长期应用生物固体和大气沉积物后,微塑料在土壤中的积累
Kaushik Adhikari1, Carolyn I Pearce2, Karen A Sanguinet1
1Department of Crop & Soil Sciences, Washington State University, Pullman, WA 99164, and Puyallup, WA 98371, USA.
The Science of the total environment
|December 1, 2023
概括
土地应用的生物固体显著增加了土壤微塑料. 大气沉积也为农业土壤贡献塑料颗粒,突出土壤污染的双重来源.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 生态毒理学 生态毒理学
背景情况:
- 土地应用的生物固体是已知的土壤微塑料的来源.
- 大气沉积对土壤微塑料污染的贡献尚不清楚.
- 农业土壤面临着来自多个来源的微塑料污染日益增加.
研究的目的:
- 测量和描述土壤中的微塑料,并对其进行长期生物固态应用.
- 评估大气沉积对土壤微塑料负载的贡献.
- 为了确定生物固体,土壤和大气样本中占主导地位的微塑料类型.
主要方法:
- 从23年来不同生物固体应用率 (0-9.0t/ha) 的实地试验中采集的土壤样本.
- 大气沉积样本收集超过2年.
- 使用芬顿反应和密度分离提取微塑料,然后进行光学显微镜和LDIR分析.
主要成果:
- 生物固体中平均含有12,000个微塑料颗粒/kg.
- 长期应用生物固体显著增加了土壤微塑料度 (361-500颗/千克) 与未经修改的土壤 (117颗/千克) 相比.
- 大气沉积增加了大约15颗颗粒/千克/年,主要是聚胺纤维.
结论:
- 长期的生物固体应用导致农业土壤中显著的微塑料积累.
- 大气沉积代表了微塑料在土壤中的大量,但经常被忽视的投入.
- 聚氨,聚乙烯和聚胺是主要的微塑料类型.
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