藻源性内毒素在铜绿微囊藻灭活过程中的释放  

Release of algae-derived endotoxins during inactivation of Microcystis aeruginosa

作　　者：卜令君 周石庆[1] 施周[1] 王涛[1] 衣启航 孙聚龙 BU Ling-jun;ZHOU Shi-qing;SHI Zhou;WANG Tao;YI Qi-hang;SUN Ju-long(Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, College of Civil Engineering, Hunan University, Changsha 410082, China)

机构地区：[1]湖南大学土木工程学院,建筑安全与节能教育部重点实验室,湖南长沙410082

出　　处：《中国环境科学》2017年第12期4675-4680,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(51508174)

摘　　要：次氯酸钠、双氧水、硫酸铜及敌草隆是4种目前常用的化学除藻剂,分别基于不用的原理灭活藻细胞,从而控制藻类爆发,但藻类在凋亡的过程中会伴随有藻源性内毒素的释放.通过研究和对比以上4种除藻剂对灭藻过程中藻源性内毒素的释放规律,结果显示:0.10~0.50mg/L次氯酸钠灭活藻类1周分别释放1564.78,872.14,852.03EU/mL内毒素;0.10~0.50mmol/L双氧水在灭活过程中分别释放内毒素732.23,1706.22,944.84EU/mL;0.5~2.5μmol/L硫酸铜在该过程中伴随有854.60,1055.45,1513.15EU/mL内毒素的释放;5~25μmol/L敌草隆则导致了1802.23,1788.11,1886.14EU/mL内毒素在灭活过程中释放.即具有氧化性的除藻剂可以降解溶液中的部分内毒素,不具氧化性的除藻剂无法有效控制和降解释放的内毒素.但上述所有情况的内毒素含量均远超过藻类自然代谢所产生的内毒素含量(113.86EU/mL).因此,高藻水源水中藻类即使已被有效控制,人们仍应尽量避免直接接触以减少内毒素暴露风险.NaClO,H2O2,CuSO4and diuron are four commonly used chemical algaecides at present.All of them can inactivate algaes and control algae blooms based on different mechanisms.However,algae-derived endotoxins can be released during inactivation of Microcystis aeruginosa.The effects of these algaecides on the release of endotoxins were evaluated and compared,and the following results were obtained:Endotoxins of1564.78,872.14,and852.03EU/mL were released after inactivation of algae by0.10~0.50mg/L NaClO,while732.23,1706.22,and944.84EU/mL endotoxins were detected when treated by0.10~0.50mmol/L H2O2.When the algae was inactivated by0.5~2.5μmol/L CuSO4,854.60,1055.45,and1513.15EU/mL endotoxins were found in water.Endotoxins of1802.23,1788.11,and1886.14EU/mL were released when5~25μmol/L diuron was used for inactivation of algae.Algaecides with oxidizing ability can degrade part of endotoxins in solution,while algaecides without oxidizing ability cannot control and degrade the releasing endotoxins efficiently.However,the concentrations of endotoxins under all aforementioned conditions were far greater than that produced via normal metabolism(113.86EU/mL).Therefore,even though the algae in algae-laden water were controlled,it is also necessary to avoid the direct contact with the water to reduce the exposure of endotoxins.

关 键 词：藻源内毒素 次氯酸钠 双氧水 硫酸铜 敌草隆 

分 类 号：X522[环境科学与工程—环境工程]