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在土壤中塑化剂释放和降解的动力学

Alex Billings¹, Kevin C Jones², M Glória Pereira³

¹UK Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster, LA1 4AP, UK; Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, UK.

Environmental pollution (Barking, Essex : 1987)

|March 6, 2025

概括

像DEHTP这样的新兴塑化剂迅速从PVC微塑料中释放到土壤中. 一些持久性塑化剂可能会积累,增加未来的土壤污染.

科学领域:

环境化学环境化学
土壤科学土壤科学
聚合物科学聚合物科学

背景情况:

酸增塑剂越来越多地被新兴的替代品所取代.
关于这些新型塑化剂在土壤中的环境命运的数据有限.
聚乙烯 (PVC) 微塑料可以含有大量的塑化剂.

研究的目的:

为了研究从PVC微塑料中释放到土壤中的二甲基六甲基甲甲酸盐 (DEHTP) 的释放率.
为了确定不同类型的土壤中各种甲酸盐和非甲酸盐可塑剂的降解率和持久性.
评估影响塑化剂持久性的因素,如疏水性和土壤特性.

主要方法:

实验室研究模拟3个月内从PVC微塑料中释放塑化剂.
从PVC颗粒中释放的DEHTP的测量.
在三个不同的土壤类型 (热带,草原,农业) 中,对12种不同可塑剂的降解半衰期量化.

主要成果:

甲基基甲甲酸盐 (DEHTP) 从PVC微塑料中迅速释放 (<2小时).
在12种塑化剂中,有7种具有短半衰期 (<30天),这表明其持久性较低.
五种较高分子量可塑剂,包括DEHTP和三三,更持久 (半衰期>100天).
塑化剂持久性与logK_OW正相关,在酸性,有机物质较低的土壤中较慢.

结论:

微塑料中DEHTP的快速释放表明直接暴露在环境中.
一些新兴塑化剂的潜在持久性引发了对未来土壤污染的担忧.
土壤特性显著影响增塑剂降解率,而酸性,低有机物质的土壤的分解速度较慢.

关键词:

降解降解是一种降解.泄漏泄漏是一种泄漏.微塑料是一种微塑料.移民移民移民塑化剂是一种可塑化剂.释放释放释放释放

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