相关实验视频

Updated: Jun 9, 2025

Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture

Isolation of Native Soil Microorganisms with Potential for Breaking Down Biodegradable Plastic Mulch Films Used in Agriculture

Published on: May 10, 2013

在模拟老化条件下,从食品包装膜中快速生成微塑料和塑料衍生的溶解有机物质

Liuwei Wang¹, Jing Gao¹, Wei-Min Wu²

¹School of Environment, Tsinghua University, Beijing 100084, China.

Environmental science & technology

|October 28, 2024

概括

在常见的制备和储存条件下,低密度聚乙烯食品包装释放出大量的微塑料 (MP) 和由塑料衍生的溶解有机物 (DOM). 这项研究量化了释放量,突出了这些无处不在的塑料包装带来的潜在风险.

科学领域:

环境科学环境科学
材料科学材料科学材料科学
食品科学食品科学食品科学

背景情况:

低密度聚乙烯 (LDPE) 薄膜广泛用于食品包装.
微塑料 (MP) 和溶解有机物 (DOM) 是新兴的环境污染物.
不完全理解MP和DOM在各种条件下从食品包装中释放出来的情况.

研究的目的:

在模拟的食品制备和储存条件下,从LDPE薄膜中研究MP和DOM的生成.
量化MP和DOM的释放率.
为了描述释放的DOM的化学性质.

主要方法:

使用微波辐射,加热,蒸汽,紫外线辐射,制冷,冷和冷解循环,模拟LDPE薄膜的老化.
使用显微镜 (尺寸范围为10-5000微米) 量化MPs.
使用超高分辨率质谱法 (分子重量200-800 Da) 进行DOM的表征.

主要成果:

与对照组相比,LDPE膜产生了66-2034个MP/cm2,比对照组增加了15-453倍.
检测到数百到数千种来自塑料的DOM物质.
DOM含有聚乙烯降解产品和添加剂,在老化后氧化和极性增加.

结论:

低低压食品包装是MP和DOM释放的重要来源.
衰老过程,包括模拟食品制备和储存的过程,加剧了MP和DOM的产生.
需要对塑料包装的MP和DOM污染进行进一步的风险评估.

关键词:

在FT-ICR-MS中使用.老化的老化衰老的老化食品包装食品的包装微塑料微塑料的使用聚乙烯聚乙烯的使用情况.

更多相关视频

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies

Published on: July 27, 2022

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use

Sampling, Identification and Characterization of Microplastics Release from Polypropylene Baby Feeding Bottle during Daily Use

Published on: July 24, 2021

相关概念视频

Types of Step-Growth Polymers: Polyesters

Types of Step-Growth Polymers: Polyesters

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...