Comparison of C60 and TiO2 nanoparticles stability in freshwater and seawater:Preliminary results
Introduction Given the increasing production of manufactured nanomaterials (MNMs), the potential for their release in the environment and the associated risks on ecosystem health is becoming an increasing concern 1. For the risks posed by MNMs, it is necessary to consider two related factors: toxicity and exposure 2. There are many evidences suggesting that some MNMs may be toxic to ecological organisms1,3-5. Studies also pointed out that the toxicity of MNMs is strongly influenced by their surface chemistry, and thus their chemical stability, as it determines how the nanomaterial interacts with organisms. Moreover, the potential for MNMs exposure to a given substance is determined by its dispersion and mobility in a given medium (e.g, air or water) 2. Thus, the dispersion and chemical stability of nanoparticles may be the critical factors controlling their exposure and subsequent toxicity. However, both the dispersion and chemical stabilities of MNMs in water, especially in natural water (e.g. Freshwater and seawater), are not well understood 2,6 Studies are needed to address their dispersion and chemical stabilities in natural water. From this view, in this work, we dispersed two commercial available MNMs, Fullerene (C60) and nanoscale Titanium Dioxide (nTiO2), in natural freshwater and seawater, and then make a comparison on their physic-chemical properties and stabilities, in term of their aggregation/sedimentation, size distribution, zeta potential and morphology. The results are of importance for designing and interpreting MNMs ecotoxicity studies in natural environments.
Xiaoshan Zhu Zhonghua Cai
Division of Marine Science and Technology, Graduate School at Shenzhen, Tsinghua University
国际会议
北京
英文
239-340
2011-11-24（万方平台首次上网日期，不代表论文的发表时间）