微塑料在尼泊尔科希河流域河流沉积物的分布和特征,尼泊尔
Alisha Dahal1, Bishal Dahal1, Sagar Sitaula2
1Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu, Nepal.
Environmental pollution (Barking, Essex : 1987)
|April 5, 2025
概括
尼泊尔河流中的微塑料污染很大,下游的度更高. 农业和人类活动是主要来源,需要有针对性的缓解策略.
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:
- 微塑料 (MP) 是水生生态系统中普遍存在的环境污染物.
- 了解河流沉积物中的MP分布对于来源识别和运输机制至关重要.
研究的目的:
- 在尼泊尔阿伦,塔莫尔和科希河的沉积区绘制和量化微塑料.
- 确定这些河流系统中微塑料污染的来源并评估污染风险.
主要方法:
- 在三个沉积区域 (R0,R1,R2) 的26个地点收集了78个沉积物样本.
- 使用干燥,过氧化,密度分离,显微镜和里埃变换红外光谱 (FTIR) 的分析.
- 统计分析包括主要组件分析 (PCA) 和土地使用/土地覆盖 (LULC) 变化分析.
主要成果:
- 微塑料的丰富性在沉积区之间有所不同,下游的度更高,特别是在科希河.
- 碎片是占主导地位的形状 (52.5%),其次是20-100微米 (58.86%) 的尺寸,黑色是最常见的颜色 (33.76%).
- 识别的聚合物包括聚胺,聚烯,PVC,聚硫,尼龙和PEEK,污染风险下游增加.
结论:
- 农业和人为活动是研究河流流域微塑料污染的主要原因.
- 该研究提供了对尼泊尔东部河流中微塑料污染和来源的基本基线数据.
- 这些发现对于开发在淡水生态系统中有效的微塑料减排策略至关重要.
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