由于纳米塑料对铜生物可用性的干扰,碳封存减少
Yanting Du1, Qianyan Huang1, Shunxing Li2
1College of Chemistry, Chemical Engineering and Environment, Minnan Normal University, Zhangzhou 363000, China.
Journal of hazardous materials
|February 23, 2024
概括
聚乙烯纳米塑料 (PS-NPs) 损害了海洋藻类的生长,减少了二氧化碳的固定. 这项研究揭示了PS-NP如何破坏铜的生物可用性,影响海洋碳循环.
科学领域:
- 海洋生物学 海洋生物学
- 环境科学 环境科学
- 生态毒理学 生态毒理学
背景情况:
- 微塑料 (MP),特别是纳米塑料 (NP),是新兴的海洋污染物.
- 植物浮游生物是调节大气碳的关键初级生产者.
- 铜 (Cu) 对于浮游植物的光合作用和呼吸是必不可少的.
研究的目的:
- 研究聚乙烯纳米塑料 (PS-NP) 对铜 (Cu) 生物可用性的影响.
- 评估PS-NP对海洋藻类碳捕集能力的影响.
- 阐明连接PS-NP,Cu循环和碳动态的机制.
主要方法:
- 海洋藻Thalassiosira weissflogii和绿藻Chlorella pyrenoidosa对PS-NPs的暴露.
- 测量Cu的吸收和Cu运输蛋白的表达 (COPT1,P-ATPase).
- 在PS-NP暴露下,藻类对二氧化碳固定的量化.
主要成果:
- PS-NP 抑制了 T. weissflogii 和 C. pyrenoidosa. 的生长.
- 藻类Cu吸收与COPT1负相关,与P-ATPase正相关.
- 增加PS-NPs度导致减少Cu吸收和碳封存 (每1 mg/LPS-NPs减少0.0023 ppm的CO2).
结论:
- PS-NPs对海洋藻类生长和碳捕获产生负面影响.
- 通过改变Cu的吸收和流出,PS-NP干扰了藻类中的Cu稳态.
- 这项研究为纳米塑料对海洋生物地球化学循环的生态毒理学影响提供了新的见解.
相关概念视频
00:46Bioremediation
17.5K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
17.5K
00:56Extraction: Advanced Methods
1.3K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.3K
01:25Microbial Bioremediation of Uranium
114
Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella,...
114
01:26Microbial Bioremediation of Hydrocarbons
162
Bioremediation is an environmentally sustainable process that employs living organisms—primarily microorganisms—to degrade or neutralize pollutants from contaminated environments. In oil spills and hydrocarbon pollution, bioremediation involves the use of hydrocarbon-degrading bacteria to transform toxic compounds into less harmful substances. This approach leverages natural microbial metabolic processes and is considered both cost-effective and ecologically favorable compared to...
162
01:27Microbial Leaching
238
Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
238
01:24Microbial Corrosion
112
Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
112