摘要
本研究选择5种多溴联苯醚同系物(BDE-28、BDE-47、BDE-99、BDE-153和BDE-209)对2种海洋饵料藻(亚心型扁藻和盐生杜氏藻)进行急性毒性试验。96 h半抑制浓度(96 h EC50)计算结果表明,BDE-28和BDE-47的毒性较高,随溴原子取代数的增加,PBDE同系物对海洋饵料藻的毒性呈下降趋势,5种PBDE同系物对亚心形扁藻、盐生杜氏藻的96 h EC50由小及大依次为:BDE-28(128,75μg/L)、BDE-47(114,120μg/L)、BDE-99(383,572μg/L)、BDE-153(996,1249μg/L)和BDE-209(2056,1868μg/L)。目前全球近岸海水中PBDEs浓度尚不会对海洋饵料藻产生急性毒性。海洋微藻对同种PBDE同系物的敏感性差异较大(96 h EC50相差1~2个数量级),为客观评价PBDEs的海洋生态风险性,应研究PBDEs对更多种类微藻的毒性效应。
In this study, acute toxicity test was used to identify the effects of five PBDE congeners, named BDE-28, BDE-47 ,BDE-99 ,BDE-153 and BDE-209, to two species of marine microalgae, Platymonas subcordiformis and Du- naliella saliva, in the laboratory. The 96-h median effective concentration (96 h ECso ) for each species was calculat- ed. The results showed that BDE-28 and BDE-47 were particularly toxic to marine bait-algae and the toxicity of PBDE congeners decreased with the amount of Br atoms in the congener molecule. Ranking 96 h ECso for both P. subcordifor- m/s and D. saliva was BDE-28(128,75 μg/L) 〈 BDE-47(l14,120 μg/L) 〈 BDE-99(383,572 μg/L) 〈 BDE- 153 (996,1249 μg/L) 〈 BDE-209 (2056,1868 μg/L) . The coastal PBDEs level in the world is not enough to induce significant acute toxicity to marine bait-algae. In addition, the sensitivity of microalgae to a given congener was specific to species ,with the difference of 96 h ECso by one or two order of magnitude. Therefore acute tests with more species should be performed for evaluating objectively the ecological risk of PBDEs in coastal area.
出处
《海洋环境科学》
CAS
CSCD
北大核心
2015年第5期654-660,共7页
Marine Environmental Science
基金
国家自然科学基金项目(41240040)
关键词
多溴联苯醚
海洋饵料藻
急性毒性
96
h半抑制浓度
polybrominateddiphenyl ethers (PBDEs) , marine bait-algae, acute toxicity,96h median effective concen- trations ( 96 h EC50 )