Humic acid alleviates the toxicity of polystyrene nanoplastics in combination with their copper nanoparticle co-pollutants in Artemia salina,Environmental Science: Nano

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Humic acid alleviates the toxicity of polystyrene nanoplastics in combination with their copper nanoparticle co-pollutants in Artemia salina
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2024-09-09 , DOI: 10.1039/d4en00437j
Mahalakshmi Kamalakannan ₁ , John Thomas ₁ , Natarajan Chandrasekaran ₁

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Polystyrene nanoplastics (PSNPs) have become a ubiquitous environmental threat that can harm living organisms. Other pollutants such as copper nanoparticles (CuNPs) bind with PSNPs and humic acid (HA), alleviating the toxicity of PSNPs. In this study, individual PSNPs were interacted with CuNPs and HA to study their combined toxicity on Artemia salina. The size of PSNPs increased after 72 h of interaction with CuNPs. FTIR spectroscopy analysis confirmed that CuNPs bind to the surface of PSNPs. It was found that HA adsorbed more strongly onto PSNPs than CuNPs. Field emission scanning electron microscopy (FESEM) and energy-dispersive X-ray (EDX) spectroscopy confirmed the adsorption of HA and CuNPs onto the surface of PSNPs. Toxicity experiments showed a decreased toxicity of PSNPs and CuNPs upon their combination with HA (humic acid). Microscopic analysis showed particle accumulation in Artemia salina. The mortality rate of Artemia salina is higher in PSNP + CuNP combination. PSNPs + CuNPs showed higher production of antioxidant enzymes, and PSNPs + CuNPs + HA showed lower toxicity. This study shows that the presence of HA can lead to a reduction in the toxicity of PSNPs and CuNPs, suggesting their potential application in environmental remediation.

中文翻译：

腐植酸减轻了聚苯乙烯纳米塑料与其铜纳米粒子共同污染物在卤虫中的毒性

聚苯乙烯纳米塑料 (PSNP) 已成为一种普遍存在的环境威胁，可能危害生物体。其他污染物如铜纳米粒子（CuNP）与PSNP和腐殖酸（HA）结合，减轻PSNP的毒性。在本研究中，单独的 PSNP 与 CuNP 和 HA 相互作用，以研究它们对卤虫的联合毒性。与 CuNPs 相互作用 72 小时后，PSNPs 的尺寸增加。 FTIR 光谱分析证实 CuNPs 结合到 PSNPs 的表面。结果发现，HA 在 PSNP 上的吸附力比 CuNP 上的吸附力更强。场发射扫描电子显微镜 (FESEM) 和能量色散 X 射线 (EDX) 光谱证实了 HA 和 CuNPs 吸附在 PSNPs 表面。毒性实验表明，PSNP 和 CuNP 与 HA（腐殖酸）结合后毒性降低。显微镜分析显示卤虫体内有颗粒积累。 PSNP + CuNP 组合中卤虫的死亡率较高。 PSNPs + CuNPs 显示出较高的抗氧化酶产量，而 PSNPs + CuNPs + HA 显示出较低的毒性。这项研究表明，HA 的存在可以降低 PSNP 和 CuNP 的毒性，表明它们在环境修复中的潜在应用。

更新日期：2024-09-09

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