Effects of silica nanoparticles on growth and photosynthetic pigment contents of Scenedesmus obliquus

查看全文 作　　者：Chenxi Wei, Yanbo Zhang, Jing Guo, Bing Han, Xu Yang, Junlin Yuan Hubei Key Laboratory of Genetic Regulation and Integrative Biology, College of Life Sciences, Huazhong Normal University, Wuhan 430079, China.

出　　处：《Journal of Environmental Sciences》索引2010年第22卷第1期,共6页

基　　金：supported by the National Key Technologies R&D Programs of China (No.2006BAI19B05,2006BAJ02A10) 摘　　要：To assess the aquatic ecosystem safety for silica (SiO2) nanoparticles (NPs), the growth inhibition and photosynthetic pigment contents of Scenedesmus obliquus in logarithm growth phase exposed to SiO2 NPs and SiO2 bulk particles (BPs) suspensions were measured. SiO2 NPs with 10-20 nm diameters were found to be toxic. The 20% effective concentration (EC20) values for 72 and 96 hr were 388.1 and 216.5 mg/L, respectively. The contents of chlorophyll decreased significantly under moderate and high concentration (50, 100, and 200 mg/L) of SiO2 NPs after 96-hr exposure, but the carotenoids did not. SiO2 BPs were found to be nontoxic up to 200 mg/L. The toxicity of SiO2 NPs probablely due to their sorption to algal cells surface. The results imply that there is potential harm to aquatic environment by using SiO2 NPs, and it should deserve special concern. 关键词：纳米二氧化硅光合色素含量斜生栅藻生长抑制 SIO2颗粒纳米粒子水生生态系统有效浓度

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Effects of silica nanoparticles on growth and photosynthetic pigment contents of Scenedesmus obliquus

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