紫外线老化的聚四乙烯微塑料对铜的生物可用性和Microcystis aeruginosa生长的影响
Juanjuan Zhang1, Zihan Lin1, Fuxun Ai1
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, China.
Aquatic toxicology (Amsterdam, Netherlands)
|June 4, 2024
概括
聚四乙烯 (PTFE) 微塑料 (MP) 的环境老化降低了它们对藻类的毒性. 虽然原始和老化的PTFE MP都结合了铜,但老化减少了它们对Microcystis aeruginosa和水生生态系统的有害影响.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 材料科学 材料科学 材料科学
背景情况:
- 微塑料 (MPs) 在水生环境中普遍存在,可以影响重金属的生物可用性.
- 环境老化改变了MP的特性,影响了它们的行为和污染物的共毒性,但研究是有限的.
研究的目的:
- 为了比较原始和老化的聚四乙烯 (PTFE) MPs 的特性和 Cu2+ 的吸附性.
- 调查老年PTFEMPs对铜生物可用性和Microcystis aeruginosa的影响.
- 评估与PTFE MPs和铜共同暴露相关的环境风险.
主要方法:
- 原始和老化的PTFEMP的特征,包括表面特性和稳定性.
- 对PTFE MPs的Cu2+吸附能力的评估.
- 在不同的暴露场景下,评估铜的生物可用性和对Microcystis aeruginosa的生物效应.
主要成果:
- 老化诱导了PTFE MP的表面氧化和裂,增加了zeta潜力和降低了水的稳定性.
- PTFE MPs强烈吸附Cu2+,增加了铜对微藻的生物可用性,不受衰老的影响.
- 无论是原始的还是老化的MP都会导致细胞损伤;与Cu2+的联合暴露增加了毒性和Microcystin-LR的释放,但老化减少了这些影响.
- 具有Cu2+的老年MP增加了可溶性外聚糖 (EPS) 含量,减轻了毒性.
结论:
- 老化减轻了PTFE MPs对微藻的毒性,并降低了相关的环境风险.
- 了解老年MP和金属的联合毒性对于淡水生态系统的健康至关重要.
- 特别是老化后的PTFE MPs,与铜和菌有复杂的相互作用.
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