颗粒大小和环境条件对微塑料中二甲基基甲酸盐释放的影响
1School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
Chemosphere
|October 21, 2023
概括
微塑料污染会释放出有毒的DEHP. 较小的颗粒大小和更高的温度增加了PLA,PS和PVC等塑料中的DEHP液,而离子强度则降低了它.
科学领域:
- 环境科学 环境科学
- 聚合物化学 聚合物化学
- 毒理学 毒理学 毒理学
背景情况:
- 广泛使用塑料导致微塑料 (MP) 污染.
- 2-乙基) 甲酸盐 (DEHP) 是一种有毒的塑料添加剂,具有繁殖风险.
- 关于国会议员释放DEHP的研究有限.
研究的目的:
- 为了研究DEHP从聚乙烯 (PLA),聚烯 (PS) 和聚乙烯 (PVC) MPs中的释放.
- 为了确定颗粒大小和环境条件对DEHP释放的影响.
主要方法:
- 为了测量DEHP的释放,进行了液试验.
- 研究的因素包括粒子大小,温度,pH值,离子强度和阴离子类型 (Na+,Ca2+).
- 使用伪第一阶方法建模了DEHP释放动力学.
主要成果:
- 减少颗粒大小和增加温度显著增强了DEHP的释放.
- 较低的结晶度与较大的DEHP释放增加相关.
- 离子强度,特别是Ca2+,抑制了DEHP的释放;Na+也显示出抑制作用.
结论:
- 粒子大小,温度和离子强度是控制MPs中DEHP释放的关键因素.
- DEHP释放动力学遵循一个伪第一阶模型.
- 这些发现为管理与DEHP相关的塑料废物风险提供了基础.
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