印度复合材料中的微塑料的表征和来源分配
Dilraj Surendran1, George Kuttiparichel Varghese2, Christian Zafiu3
1Department of Civil Engineering, NIT Calicut, Kozhikode, India.
Environmental monitoring and assessment
|December 3, 2023
概括
来自未分离的城市固体废物 (MSW) 的堆肥是土壤中微塑料 (MP) 和重金属的重要来源. 一次性塑料是主要的贡献者,构成生态危险.
科学领域:
- 环境科学 环境科学
- 污染控制 污染控制
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料 (MP) 是5毫米以下的塑料颗粒,被认为是生态系统中重金属的载体.
- 来自城市固体废物 (MSW) 的堆肥是土壤微塑料污染的重要途径.
- 在堆肥中的微塑料上积累的重金属引发了生态问题.
研究的目的:
- 量化微塑料度和分析重金属积聚在印度科奇和科吉科德的MSW堆肥中的微塑料上.
- 确定存在的塑料树脂类型,并确定堆肥中微塑料污染的主要来源.
- 评估与堆肥中的微塑料和重金属污染相关的生态风险.
主要方法:
- 使用化密度分离和芬顿试剂用于有机物氧化的微塑料分离.
- 福里埃变换红外光谱 (FTIR) 用于树脂识别 (PE,PP,PS,尼龙,PET,醇共聚物).
- 微塑料和复合材料的重金属分析,以及来源分配和生态风险指数 (PLI,PHI) 的计算.
主要成果:
- 微塑料度在科济科德为840±30个/kg,在科奇为1600±111个/kg,主要是聚乙烯 (PE) 薄膜.
- 在已识别的树脂中,PE占58.3% (科济科德) 和73.37% (科奇).
- 重金属 (Pb,Cd,Zn,Cu,Mn) 在微塑料上被显著吸收,其度是堆肥中的1.022.85倍.
- 一次性塑料占微塑料来源的64% (科济科德) 和77% (科奇).
- 生态风险指数显示,来自这两个地点的堆肥的危险级别为V.
结论:
- 来自未分离的MSW的堆肥是土壤微塑料和重金属污染的主要来源.
- 一次性塑料是这些复合材料中微塑料污染的主要贡献者.
- 调查结果强调,迫切需要制定更好的废物管理策略,以减轻生态风险.
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