Institute of Coastal Environmental Pollution Control, Key Laboratory of Marine Environment and Ecology (Ministry of Education), Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266100, China.
Institute of Coastal Environmental Pollution Control, Key Laboratory of Marine Environment and Ecology (Ministry of Education), Frontiers Science Center for Deep Ocean Multispheres and Earth System, Ocean University of China, Qingdao 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China.
J Hazard Mater. 2023 Jun 5;451:131137. doi: 10.1016/j.jhazmat.2023.131137. Epub 2023 Mar 3.
Transfer of CeO engineered nanoparticles (NPs) through feces was investigated between two omnivorous organisms, red crucian carp (Carassius auratus red var.) and crayfish (Procambarus clarkii). Upon water exposure (5 mg/L, 7 days), the highest bioaccumulation was observed in carp gills (5.95 μg Ce/g D.W.) and crayfish hepatopancreas (648 μg Ce/g D.W.), with the bioconcentration factors (BCFs) at 0.45 and 3.61, respectively. In addition, 97.4% and 73.0% of ingested Ce were excreted by carp and crayfish, respectively. The feces of carp and crayfish were collected and fed to crayfish and carp, respectively. After feces exposure, bioconcentration was observed in both carp (BCF, 3.00) and crayfish (BCF, 4.56). After feeding crayfish with carp bodies (1.85 μg Ce/g D.W.), CeO NPs were not biomagnified (biomagnification factor, 0.28). Upon water exposure, CeO NPs were transformed into Ce(III) in the feces of both carp (24.6%) and crayfish (13.6%), and the transformation was stronger after subsequent feces exposure (100% and 73.7%, respectively). Feces exposure lowered histopathological damage, oxidative stress, and nutritional quality (e.g., crude proteins, microelements, amino acids) to carp and crayfish in comparison with water exposure. This research highlights the importance of feces exposure on the transfer and fate of NPs in aquatic ecosystems.
将 CeO 纳米颗粒（NPs）通过粪便从两种杂食性生物（红鲫鱼（Carassius auratus red var.）和克氏原螯虾（Procambarus clarkii））之间进行转移。暴露于水中（5mg/L，7 天）后，在鲫鱼鳃（5.95μg Ce/g D.W.）和克氏原螯虾肝胰腺（648μg Ce/g D.W.）中观察到最高的生物累积，生物浓缩因子（BCF）分别为 0.45 和 3.61。此外，鲫鱼和克氏原螯虾分别排泄了摄入的 Ce 的 97.4%和 73.0%。收集鲫鱼和克氏原螯虾的粪便并分别喂食给克氏原螯虾和鲫鱼。暴露于粪便后，在鲫鱼（BCF，3.00）和克氏原螯虾（BCF，4.56）中均观察到生物浓缩。在用鲫鱼尸体喂养克氏原螯虾（1.85μg Ce/g D.W.）后，CeO NPs 未被生物放大（生物放大因子，0.28）。暴露于水中时，CeO NPs 在鲫鱼（24.6%）和克氏原螯虾（13.6%）粪便中转化为 Ce(III)，随后暴露于粪便后，转化更强（分别为 100%和 73.7%）。与暴露于水中相比，粪便暴露降低了对鲫鱼和克氏原螯虾的组织病理学损伤、氧化应激和营养质量（例如，粗蛋白、微量元素、氨基酸）。这项研究强调了粪便暴露对纳米颗粒在水生生态系统中转移和归宿的重要性。
