Key Lab for Biomedical Effects of Nanomaterials and Nanosafety , Institute of High Energy Physics, Chinese Academy of Sciences , Beijing 100049 , China.
Key Lab of Urban Environment and Health , Institute of Urban Environment, Chinese Academy of Sciences , Xiamen 361021 , China.
Environ Sci Technol. 2018 Nov 6;52(21):12133-12141. doi: 10.1021/acs.est.8b03121. Epub 2018 Oct 29.
Fullerenol, a water-soluble polyhydroxylated fullerene nanomaterial, enters aquatic organisms and ecosystems through different ingestion exposures and may pose environmental risks. The study of their uptake routes and transfer in aquatic systems is scarce. Herein, we quantitatively investigated the aquatic uptake and transfer of C-fullerenols from Scenedesmus obliquus to Daphnia magna using C-skeleton-labeling techniques. The bioaccumulation and depuration of fullerenol in Daphnia magna increased with exposure doses and time, reaching steady state within 16 h in aqueous and feeding-affected aqueous routes. The capacity of Daphnia magna to ingest fullerenol via the aqueous route was much higher than that via the dietary route. From the aqueous to feeding-affected aqueous, the kinetic analysis demonstrated the bioaccumulation factors decreases, which revealed that algae suppressed Daphnia magna uptake of fullerenols. The aqueous route was the primary fullerenols ingestion pathway for Daphnia magna. Kinetic analysis of the accumulation and transfer in Daphnia magna via the dietary route indicated low transfer efficiency of fullerenol along the Scenedesmus obliquus-Daphnia magna food chain. Using stable isotope labeling techniques, these quantitative data revealed that carbon nanomaterials underwent complex aquatic accumulation and transfer from primary producers to secondary consumers and algae inhibited their transfer in food chains.
富勒醇是一种水溶性多羟基富勒烯纳米材料，通过不同的摄入暴露途径进入水生生物和生态系统，可能会带来环境风险。目前，对其在水生系统中吸收途径和转移的研究还很少。在此，我们使用 C-骨架标记技术定量研究了 C-富勒醇从斜生栅藻到大型溞的水生吸收和转移。富勒醇在大型溞中的生物积累和消除随暴露剂量和时间的增加而增加，在水相和摄食影响的水相途径中 16 h 内达到稳定状态。大型溞通过水相途径摄入富勒醇的能力远高于通过摄食途径。从水相向摄食影响的水相，动力学分析表明生物积累因子降低，这表明藻类抑制了大型溞对富勒醇的吸收。水相途径是大型溞摄入富勒醇的主要途径。通过摄食途径在大型溞中的积累和转移的动力学分析表明，富勒醇沿斜生栅藻-大型溞食物链的转移效率较低。使用稳定同位素标记技术，这些定量数据表明，碳纳米材料在从初级生产者到次级消费者的水生环境中经历了复杂的积累和转移，藻类抑制了它们在食物链中的转移。
