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典型的微塑料与Pb2+之间的界面相互作用及其对Chlorella pyrenoidosa的联合毒性

Yi Yu¹, Jiahao Liu¹, Jian Zhu¹

¹College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.

The Science of the total environment

|February 3, 2024

概括

紫外线老化增加了 (Pb2+) 的微塑料 (MP) 吸附,其中PET微塑料具有最高的容量. 老化PET微塑料和与藻类的联合暴露揭示了协同作用的毒性,突出了环境风险.

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 (MP) 是新兴的污染物,通常与重金属复杂化,构成联合毒性风险.
与海洋生态系统相比,在淡水环境中对MP和重金属联合毒性的研究是有限的.
了解这些相互作用对于评估淡水生态系统健康至关重要.

研究的目的:

研究5种典型的MP (PVC,PE,PP,PS,PET) 在紫外线老化前后对离子 (Pb2+) 的吸附特性.
为了评估MPs-PET和Pb2+对淡水中Chlorella pyrenoidosa的联合毒性.
阐明联合毒性的机制,包括协同作用和对抗作用.

主要方法:

进行了静态吸附试验,以确定MPs在紫外线老化前后的Pb2+吸附能力.
紫外线辐射被用来模拟微塑料颗粒的衰老.
对Chlorella pyrenoidosa进行了毒性测试,将其暴露在MPs-PET和Pb2+的单独和联合治疗中.

主要成果:

紫外线老化显著提高了所有测试的MPs对Pb2+的吸附.
MPs-PET表现出最高的吸附能力和与Pb2+最强的相互作用.
对MPs-PET和Pb2+的个体暴露显示出显著的毒性,而Pb2+更有毒.
对MPs-PET和Pb2+ (未吸收) 的联合暴露表明了协同毒性,导致对Chlorella pyrenoidosa产生最显著的不良影响.
吸附Pb2+到MPs-PET (MPs-PET@Pb2+) 降低了Pb2+度和化学压力,但来自MPs-PET的物理压力仍然是一个威胁.

结论:

紫外线衰老的微塑料,特别是PET,在淡水中具有更高的结合重金属 (如) 的潜力.
微塑料和的联合毒性可能具有协同作用,对淡水藻类构成重大风险.
这项研究为评估与淡水生态系统中微塑料重金属共同污染相关的环境风险提供了关键数据.

关键词:

吸附行为吸附行为克洛瑞拉 (Chlorella pyrenoidosa) 是一种天然的植物.结合的毒性结合的毒性微塑料是一种微塑料.Pb ((2+) 是一个值.

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