Toxicity of oxide nanoparticles to the green algae Chlorella sp.
Toxicity of oxide nanoparticles to the green algae Chlorella sp.
复制标题
氧化物纳米粒子对绿藻小球藻的毒性。
DOI：
10.1016/j.cej.2010.11.026
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发表时间：
2011-06-01
影响因子：
15.1
通讯作者：
Lin, Daohui
中科院分区：
文献类型：
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作者：
Ji, Jing;Long, Zhifeng;Lin, Daohui
越来越多的研究集中在纳米毒性，但仍有许多未知数有待调查。研究了4种纳米氧化物（Al 2 O3、SiO2、ZnO和TiO 2）对绿色球藻的毒性。纳米Al 2 O3、SiO2和TiO 2（DJ 3，金红石型）对小球藻的毒性不明显，而纳米ZnO和纳米TiO 2（HR 3，金红石型）对小球藻的生长有明显的抑制作用，6d EC 30约为100。20和30 mg L-1。对比实验表明，当试验材料浓度低于50 mg L-1时，对藻类的毒性大小顺序为Zn 2 + >纳米ZnO>体相ZnO。当浓度>50 mg L-1时，纳米ZnO对藻类的毒性高于Zn 2+，且纳米ZnO向培养基中释放的Zn 2+比本体ZnO少，说明纳米ZnO溶解的Zn 2+不是藻类生长抑制的主要机制。通过比较有光照和无光照下的纳米毒性，也排除了纳米ZnO和HR 3的遮光效应。纳米ZnO和HR 3的大聚集体捕获和包裹的藻细胞，这可能有助于纳米毒性。这些结果将有助于理解氧化物纳米颗粒的毒性。(C)2010 Elsevier B. V.保留所有权利。
Increasing studies focus on nanotoxicity, but many unknowns are remaining to be investigated. This study examined toxicities of four varieties of oxide nanoparticles (Al2O3, SiO2, ZnO, and TiO2) to the green algae Chlorella sp. Nanoparticulate Al2O3, SiO2, and TiO2 (DJ3, rutile) had no significant toxicity, whereas nano-ZnO and nano-TiO2 (HR3, anatase) greatly inhibited the algal growth with 6d EC30 of ca. 20 and 30 mg L-1, respectively. Comparative experiments showed the algal toxicities decreased with an order of Zn2+ > nano-ZnO > bulk-ZnO when the concentration of the test material was lower than 50 mg L-1. However, nano-ZnO had higher algal toxicity than Zn2+ ions at concentrations >50 mg L-1 and released less Zn2+ ions into the culture media than bulk-ZnO, which suggests that dissolved Zn2+ ions from nano-ZnO were not the dominant mechanism for the algal growth inhibition. Shading effects of nano-ZnO and HR3 were also excluded from the main mechanism of the nanotoxicity by the comparison of the nanotoxicities in the presence and absence of illumination. Large aggregates of nano-ZnO and HR3 entrapping and wrapping the algal cells were observed, which may contribute to the nanotoxicity. These results will be helpful for understanding the toxicity of oxide nanoparticles. (C) 2010 Elsevier B.V. All rights reserved.