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银纳米粒子改变淡水中等宇宙中的浮游生物介导的碳循环过程

Peng Wang¹, Qianqian Xiang², Zihao Fu¹

¹Institute of International Rivers and Eco-security, Yunnan Key Laboratory of International Rivers and Trans-Boundary Eco-security, Yunnan University, Kunming 650091, People's Republic of China; Yunnan International Joint Research Center for Hydro-Ecology Science & Engineering, Yunnan University, Kunming 650091, People's Republic of China.

Journal of hazardous materials

|April 17, 2025

概括

暴露于银纳米粒子 (AgNPs) 显著改变了水生碳循环. AgNP增强了浮游生物的活动,促进了碳固定和分解,同时减少了二氧化碳的释放,影响了生态系统的健康.

科学领域:

环境科学环境科学
生态毒理学生态毒理学
水生生态学水生生态学

背景情况:

纳米粒子,特别是银纳米粒子 (AgNPs),在水生环境中越来越普遍.
暴露于AgNP的生态后果,特别是浮游生物介导的碳循环,尚不清楚.
了解这些影响对于评估对淡水生态系统的风险至关重要.

研究的目的:

研究AgNP暴露对淡水生态系统中浮游生物介导的碳循环的长期影响.
量化碳固定,分解和转化过程中的变化.
评估水空气界面对二氧化碳释放的影响.

主要方法:

使用淡水生态系统进行了为期28天的中宇宙实验.
使用了AgNP的环境相关度 (10和100μg/L).
测量包括植物浮游生物和动物浮游生物质,光合作用活动,微生物碳利用,溶解和颗粒有机碳以及二氧化碳释放.

主要成果:

暴露于AgNP增加了植物浮游生物和动物浮游生物的生物质和光合作用活动,增强了碳固定.
微生物群落显示出更大的利基范围和更改的碳来源利用率,以及受损的脂质代谢,促进分解.
AgNPs降低了溶解的有机碳,增加了有机碳沉积颗粒,分别在10和100μg/L下降了9%和17%的CO2排放量.

结论:

长期暴露于AgNP会显著改变水生生态系统中浮游生物介导的碳循环.
在浮游生物群落内,AgNP促进了碳固定和分解途径.
这些发现提供了对淡水环境中纳米粒子生态毒理学影响和风险评估的关键见解.

关键词:

碳循环是一个碳循环.淡水生态系统淡水生态系统一个中宇宙 (Mesocosm).纳米颗粒纳米颗粒浮游生物群落浮游生物群落

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