在不同的悬浮沙度下,老化塑料碎片的液的动态变化及其毒性
Lingzhan Miao1, Zhuoyi Jin1, Hanlin Ci2
1Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes, Ministry of Education, College of Environment, Hohai University, Nanjing 210098, PR China.
Journal of hazardous materials
|December 19, 2024
概括
生物降解塑料 (BPs) 释放的液比传统塑料更有害,特别是在沙水生环境中. 这些BP浸出物带来了更大的生态风险,影响了像大夫尼亚大夫尼亚这样的水生生物.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 聚合物科学 聚合物科学
背景情况:
- 塑料污染是一个主要的环境问题,漏物带来了生态风险.
- 生物降解塑料 (BPs) 是传统非生物降解塑料 (non-BPs) 的替代品,但它们的漏风险尚未得到充分研究.
- 水生生态系统通常含有悬浮沉积物,这些沉积物可以影响塑料的降解和液的释放.
研究的目的:
- 调查在水生环境中老化生物降解塑料 (BPs) 和非生物降解塑料 (non-BPs) 的液释放和毒性.
- 在不同的悬浮沉积物度下,比较不同类型塑料的液所带来的生态风险.
- 评估液对水生生物,特别是大夫尼亚大的影响.
主要方法:
- 控制的实验室研究,将聚乙烯二甲 (PET),聚烯 (PP),聚乳酸 (PLA) +聚乙烯基酸二甲 (PBAT) 和基于粉的塑料 (SBP) 暴露在老化条件下.
- 溶解有机碳 (DOC) 和分子重量分布的漂水分析.
- 使用大夫尼亚大进行毒性测试,以评估液产物的影响.
主要成果:
- BPs释放的DOC度明显高于非BPs,特别是在更高的悬浮沙度下 (PLA+PBAT高达2.69 mg/L).
- 与非BP液相比,BP液含有较大的分子量有机物质和类似蛋白质的物质.
- 来自BP的液对大夫尼亚大菌具有更大的毒性,PLA+PBAT液在500mg/L悬浮沙中引起30%的抑制率.
结论:
- 尽管它们具有预期的可降解性,但BP可能会通过在水环境中释放液而增加生态风险,特别是那些含有大量悬浮沉积物的水环境.
- 来自BP的液的成分和分子量与非BP的不同,这有助于它们更高的毒性.
- 全面的生态风险评估对于管理传统塑料和可生物降解塑料对环境的影响至关重要.
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