摘要:石墨烯自合成以来就以其独特的性质备受瞩目,在科研及工业领域有广阔的前景,作为明星纳米材料,其在产品中的使用日益增多,随之带来的环境生态风险也越大。本文以原生动物四膜虫为受试生物探究了不同浓度石墨烯在其体内的富集情况,并加入天然有机质使实验环境更接近自然环境,模拟石墨烯在真实环境中的自然归趋。实验结果表明石墨烯对四膜虫无急性毒性,短时间暴露不会影响四膜虫的生长,暴露2小时后单个四膜虫体内的富集量达到最大,随着暴露时间的延长其体内的石墨烯含量逐渐下降,原因很可能是四膜虫的生长速率大于了吸收速率。此外,还发现天然有机质对四膜虫富集石墨烯无明显影响。该研究为石墨烯在水环境中的风险表征提供实验数据,也可为以后的研究提供基础资料。30400
关键词:石墨烯;四膜虫;生态风险;生物富集
Research on the bioaccumulation of 14C- graphene in water by Thermophila
Abstract: Since its discover, graphene have drawn great attention for the unique properties, and has broad prospects in scientific research and industrial field. As the star of nanomaterial, its use in the product is increasing, the ecological risk environment will bring greater. In this paper, Thermophila was used as testing organism to explore the accumulation of different concentrations of graphene, and natural organic matter was added into the system to make the experimental environment closer to the natural environment, so we could simulate the natural fate of graphene in the real environment. The experimental results show that graphene has no acute toxicity to Thermophila, which can not affect the Thermophila growth of Thermophila in a short time. After 2 hours, the accumulation in single Thermophila reached the maximum, and then decreased along with the exposure, which may be attributed to the face that the growth rate of the Thermophila is greater than the rate of absorption. Moreover, We found that natural organic matter has no influence on the accumulation of graphene by the Thermophila. The results provide fundamental data for assessing the potential ecological risks of graphene.
Key words: graphene;Thermophila;ecological risk;bioaccumulation
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