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土壤侵蚀是纳米和微塑料从耕地进入河流系统的主要驱动因素

Yanting Wang¹, Siyuan Jing², Peiyu Hou³

¹MOE Key Laboratory of Environmental Remediation and Ecosystem Health, Institute of Environmental Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.

|April 13, 2024

概括

纳米和微塑料 (NMP) 在中国农业土壤中普遍存在,对水生生态系统构成威胁. 由水驱动的土壤侵蚀对河流中的NMP污染有很大影响,这凸显了有效侵蚀管理的必要性.

科学领域:

环境科学环境科学
生态毒理学生态毒理学
分析化学分析化学

背景情况:

纳米和微塑料 (NMP) 是全球关注的新兴污染物,原因是它们对水生生态系统的不利影响和潜在的人类健康风险.
量化NMP排放量和了解它们从陆地到水中运输路径对于制定减缓策略至关重要.
农业活动是NMP的重要来源,水驱动的土壤侵蚀作为主要的运输机制进入河流系统.

研究的目的:

通过水驱动的土壤侵蚀量化NMP从农田进入中国河流系统的质量输入.
确定从耕地产生的NMP的主要来源和运输途径.
评估农业土壤侵蚀对中国河流NMP总体污染的贡献.

主要方法:

从中国9个排水盆地的120个种植场所收集了土壤样本.
六种常见的塑料类型 (PVC,PMMA,PP,PE,PC,PS) 的残留物用热溶解/热解气色谱-质谱学量化.
修订的普世土壤损失方程 (RUSLE) 模型被用于估计土壤侵蚀产生的NMP质量排放量.

主要成果:

在所有土壤样本中检测到NMP,其度范围为3.6至816.6μg/g干重 (中位数:63.3μg/g).
据估计,由于农业水力驱动的土壤侵蚀,每年可能有22,700NMP进入中国的河流系统,主要从5月到9月.
农业土壤侵蚀造成的90%以上的河流NMP来源于36.5%的耕地,集中在长江,西南和珍珠河流域.

结论:

在中国,水驱动的土壤侵蚀是NMP从农田迁移到水生环境的重要途径.
在关键农业地区,有针对性的侵蚀管理策略可以大幅减少河流系统中NMP污染.
解决NMP污染需要综合方法,重点关注源控制和运输路径管理.

关键词:

农业土壤土壤微塑料是一种微塑料.纳米塑料的纳米塑料修订的普世土壤损失方程模型在TD/Py-GCMS中使用.

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