摘要
采用96h急性毒性实验的方法,研究了新型纳米材料硫化镉量子点(CdS)对斜生栅藻的毒性效应。结果表明,随着量子点浓度的增大,其对斜生栅藻生长的抑制作用也在增大,并在浓度为1.0mg·L-1时达到了显著抑制作用。通过光学显微镜观察发现,经过量子点处理之后的斜生栅藻细胞形态出现了变化,并且随着处理浓度的增大,藻细胞颜色变浅的程度也增大,这说明硫化镉量子点可能对藻细胞色素的合成存在阻碍作用。在处理96h后,硫化镉量子点对藻细胞光合色素含量的影响和藻密度的影响是一致的,各浓度组SOD(超氧化物歧化酶)含量相比于对照组均出现了显著变化,而MDA(丙二醛)含量则是在浓度为0.2、0.4、0.6mg·L-1时与对照组相比变化较小,在浓度为0.8、1.0mg·L-1时出现较显著变化,并且SOD和MDA含量在浓度为1.0mg·L-1时呈明显负相关关系,这说明在各组均发生了不同程度的脂质过氧化反应。
Nanotechnology engineering is rapidly growing with promises of substantial benefits.However,worries have been raised that their properties making them so attractive are thought to have potential health or environmental hazards.This study was designed to assess the acute toxicity of quantum dot cadmium sulfide（CdS QDs）nanomaterial on aquatic ecosystem.It is widely used in light chemical batteries,energy storage device,photoluminescence,electroluminescence,sensors,infrared window material and light catalysis.Scenedesmus obliquus was exposed to different CdS QDs concentrations（0 mg·L-1,0.2 mg·L-1,0.5 mg·L-1 and 1 mg·L-1）and algal growth was daily assayed while shape and color of cells,photosynthesis pigments,free malondialdehyde（MDA）and superoxide dismutase（SOD）content were assayed after 96 h exposure.The concentration of 1.0 mg·L-1 caused a significant algal growth inhibition.The optical microscopy images showed cells＇ tendancy to turn pallor when CdS QDs concentration is increased,indicating that it might inhibit the synthesis of chlorophylls whose content varied with cell density.The MDA and SOD contents were opposite,indicating that varying degrees of lipid peroxidation occurred in the cell membrane.This study contributes to the assessment of toxicological effect of quantum dot cadmium sulfide on aquatic ecosystem.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2013年第3期524-529,共6页
Journal of Agro-Environment Science
基金
国家大学生创新性试验计划项目
国家自然科学基金(30771429.31071653)
教育部留学归国人员科研基金
