量化多氯联苯和纳米级聚苯乙烯对大型溞的联合毒性效应。
Quantification of the combined toxic effect of polychlorinated biphenyls and nano-sized polystyrene on Daphnia magna.
机构信息
MOE Key Laboratory of Aquatic Product Safety/KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China.
Guangzhou Key Laboratory of Environmental Exposure and Health, and Guangdong Key Laboratory of Environmental Pollution and Health, School of Environment, Jinan University, Guangzhou 510632, China.
出版信息
J Hazard Mater. 2019 Feb 15;364:531-536. doi: 10.1016/j.jhazmat.2018.10.056. Epub 2018 Oct 27.
It has been reported that nanoplastics (NP) could cause serious toxicity and accumulative effects on aquatic organisms as well as interact with organic pollutants and influence potential hazards when exposed to biota. The current study aimed to quantitatively investigate the combined acute toxic effect of polychlorinated biphenyls (PCBs) and nano-sized polystyrene (PS) plastic on aquatic organisms based on analyte speciation. First, the combined acute toxicity of PCB-18 and 100 nm PS to Daphnia magna (D. magna) in water was evaluated. Then, speciation analysis of the exposure system was conducted by measuring the sorption coefficients (logK) of PCBs to nano-sized PS (ranging from 5.28 to 6.56), which demonstrated the PS could substantially decrease the free concentrations of PCBs. The results showed that a low concentration of the PS could decrease the toxicity to D. magna., which might be originated from the decreased free concentration of PCB-18. However, when the PS concentration was high enough, an opposite effect was observed because the PS dominated the lethality instead of PCB-18. The current study is helpful to clarify the PCB occurrence in ecosystems and provide an in-depth understanding of the eco-toxicological effects of nanoscale plastics.
据报道，纳米塑料（NP）可能对水生生物造成严重毒性和累积效应，并与有机污染物相互作用，在暴露于生物群时影响潜在危害。本研究旨在基于分析物形态定量研究多氯联苯（PCBs）和纳米级聚苯乙烯（PS）塑料对水生生物的联合急性毒性作用。首先，评估了水中 PCB-18 和 100nm PS 对大型溞（D. magna）的联合急性毒性。然后，通过测量 PCBs 与纳米级 PS 的吸附系数（logK，范围为 5.28 至 6.56）对暴露系统进行了形态分析，这表明 PS 可显著降低 PCBs 的游离浓度。结果表明，低浓度的 PS 可降低 D. magna 的毒性，这可能源于 PCB-18 的游离浓度降低。然而，当 PS 浓度足够高时，会观察到相反的效果，因为 PS 主导了致死性，而不是 PCB-18。本研究有助于阐明生态系统中 PCBs 的存在，并深入了解纳米塑料的生态毒理学效应。
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