5种多溴联苯醚同系物对海洋饵料藻(亚心型扁藻和盐生杜氏藻)的急性毒性
Acute toxicity of five brominated diphenyl ether congeners to marine bait-algae species:Platymonas subcordiformis and Dunaliella saliva
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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(128,75 g/L)、BDE-47(114,120 g/L)、BDE-99(383,572 g/L)、BDE-153(996,1249 g/L)和 BDE-209(2056,1868 g/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。Abstract: 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 Dunaliella saliva, in the laboratory.The 96-h median effective concentration (96 h EC50) for each species was calculated.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 EC50 for both P.subcordiformis and D.saliva was BDE-28(128, 75 g/L) BDE-47(114, 120 g/L) EC50 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.
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