在沉积物中释放,降解和分布PVC微塑料原产的甲酸和非甲酸可塑剂
Gayatri Panthi1, Rishikesh Bajagain1, Dhiraj Kumar Chaudhary1
1Department of Environmental Engineering, Korea University Sejong Campus, 2511 Sejong-ro, Sejong City 30019, Republic of Korea.
Journal of hazardous materials
|April 10, 2024
概括
塑化剂从PVC微塑料中浸出到沉积物中,并通过生物和非生物过程经历显著的降解. 细菌物种被确定为关键的增塑剂降解剂,影响微生物群落.
科学领域:
- 环境化学环境化学
- 微生物学 微生物学
- 聚合物科学 聚合物科学
背景情况:
- 增塑剂是聚乙烯 (PVC) 产品中常见的添加剂.
- 微塑料 (MPs) 可以将增塑剂浸出水和陆地环境中.
- 浸塑化剂的环境命运和降解途径尚未完全理解.
研究的目的:
- 研究从PVC MPs中出甲酸盐和非甲酸盐可塑剂到沉积物中的液.
- 确定这些可塑剂在30天内的降解速度和机制 (无生物与生物).
- 分析塑化剂降解对细菌群落的影响,并确定关键的降解微生物.
主要方法:
- 在沉积物微观宇宙中30天内化PVC MPs.
- 使用分析技术量化浸出塑化剂的量化.
- 通过非生物和生物过程进行降解的评估.
- 使用分子方法分析细菌社区结构,丰富度和功能基因.
主要成果:
- 在30天内实现了超过99.9%的增塑剂降解.
- 与非生物过程 (72%) 相比,生物过程的降解率更高 (94%),但非生物的降解也很大.
- 增塑剂的分离行为改变了后无生物降解,低分子量化合物减少,高分子量化合物增加.
- 细菌群体的多样性减少,组成也发生了变化,Bacillus被确定为一种主要的可塑化剂降解剂.
结论:
- 塑化剂从PVC MP中出,并通过生物和非生物途径在沉积物中大幅降解.
- 微生物群落在可塑化剂生物降解中发挥着至关重要的作用,例如Bacillus等特定属是非常有效的.
- 了解这些降解过程对于评估与塑化剂污染相关的环境风险至关重要.
更多相关视频
05:31Sampling, Sorting, and Characterizing Microplastics in Aquatic Environments with High Suspended Sediment Loads and Large Floating Debris
Published on: July 28, 2018
16.0K
05:48Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use
Published on: July 24, 2021
5.6K
相关概念视频
The Phosphorus Cycle
36.8K
Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
36.8K
Types of Step-Growth Polymers: Polyesters
2.2K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.2K
