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...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。展开更多
The study provides insight into the combined effect of sorbent surface functionalities and microporosity on2,2 ′,4,4 ′-tetrabromodiphenyl ether （BDE-47） sorption onto biochars. A series of biochars prepared underd...The study provides insight into the combined effect of sorbent surface functionalities and microporosity on2,2 ′,4,4 ′-tetrabromodiphenyl ether （BDE-47） sorption onto biochars. A series of biochars prepared underdifferent conditionswere used to test their sorption behaviorswith BDE-47. The extents of sorption behaviorswere parameterized in terms of the single-point adsorption equilibrium constant （Koc ） at three equilibrium concentration （C e ） levels （0.001Sw （solubility）, 0.005Sw , and 0.05Sw ）whichwasdetermined using the Freundlich model. To elucidate the concentration-dependentdominant mechanisms for BDE-47 sorption onto biochars, K ocwas correlatedwith four major parameters using multiple parameter linear analysis accompaniedwith significance testing. The results indicated that at low concentration （Ce = 0.001Sw ）, the surface microporosity term,which represented a pore-filling mechanism, contributed significantly to this relationship,while as concentrationwas increased to higher levels, surface functionality related to surface adsorption began to take thedominant role,whichwas further confirmed by the results of Polanyi-based modeling. Given the above results, adual mode model based on Dubinin-Radushkevich andde Boer-Zwikker equationswas adopted to quantitatively assess the changes of significance of surface adsorption aswell as that of pore fillingwith sorption processdevelopment. In addition, UV spectra of four typical aromatic compoundswhich represented the key structural fragments of biochars before and after interactionswith BDE-47were analyzed todetermine the active functional groups and supply complementary evidence for thedominant interaction force for surface adsorption, based onwhich π-π electron-donor-acceptor interactionwas proposed to contribute greatly to surface adsorption.展开更多
文摘本研究选择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。
基金supported by the Special Environmental Research Funds for Public Welfare(No.201209053)
文摘The study provides insight into the combined effect of sorbent surface functionalities and microporosity on2,2 ′,4,4 ′-tetrabromodiphenyl ether （BDE-47） sorption onto biochars. A series of biochars prepared underdifferent conditionswere used to test their sorption behaviorswith BDE-47. The extents of sorption behaviorswere parameterized in terms of the single-point adsorption equilibrium constant （Koc ） at three equilibrium concentration （C e ） levels （0.001Sw （solubility）, 0.005Sw , and 0.05Sw ）whichwasdetermined using the Freundlich model. To elucidate the concentration-dependentdominant mechanisms for BDE-47 sorption onto biochars, K ocwas correlatedwith four major parameters using multiple parameter linear analysis accompaniedwith significance testing. The results indicated that at low concentration （Ce = 0.001Sw ）, the surface microporosity term,which represented a pore-filling mechanism, contributed significantly to this relationship,while as concentrationwas increased to higher levels, surface functionality related to surface adsorption began to take thedominant role,whichwas further confirmed by the results of Polanyi-based modeling. Given the above results, adual mode model based on Dubinin-Radushkevich andde Boer-Zwikker equationswas adopted to quantitatively assess the changes of significance of surface adsorption aswell as that of pore fillingwith sorption processdevelopment. In addition, UV spectra of four typical aromatic compoundswhich represented the key structural fragments of biochars before and after interactionswith BDE-47were analyzed todetermine the active functional groups and supply complementary evidence for thedominant interaction force for surface adsorption, based onwhich π-π electron-donor-acceptor interactionwas proposed to contribute greatly to surface adsorption.
