几种除藻剂对铜绿微囊藻生长的毒性效应  

Toxic effect of Cu^(2+),H_2O_2 and 3-1,1-dimethylurea(DCMU) to Microcystis aeruginosa

作　　者：李今[1] 华江环[1] 

机构地区：[1]湖北师范学院生命科学学院,湖北黄石435002

出　　处：《沈阳师范大学学报（自然科学版）》2011年第3期444-448,共5页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家水体污染控制与治理科技重大专项子课题(2008ZX07106-2-2)

摘　　要：研究了3种除藻剂硫酸铜(CuSO4)、双氧水(H2O2)、二氯苯(基)二甲脲(DCMU)对铜绿微囊藻(Microcystis aeruginosa)生长的毒性效应。结果表明,Cu2+浓度小于10-4mol/L时,能促进铜绿微囊藻的生长;当浓度达到10-4mol/L时,铜绿微囊藻的OD750值和叶绿素含量明显下降,处理96 h后,2者值均趋近于0,说明该浓度的Cu2+对铜绿微囊藻具有毒性效应。H2O2质量分数为0.002‰时,24 h内对铜绿微囊藻具有明显的抑制作用,之后抑制作用逐步减弱,铜绿微囊藻的OD750值和叶绿素含量逐步恢复至起始水平;H2O2浓度为0.004‰时,随时间的延长,微囊藻生物量和叶绿素含量持续下降,至96 h,OD750值趋近于0,叶绿素含量降至0.15μg/mL,对铜绿微囊藻产生了有效的毒性效应。DCMU浓度为10μmol/L时,藻细胞密度OD750值和叶绿素含量呈明显下降趋势;至48 h,叶绿素含量降为0,说明10μmol/L DCMU对铜绿微囊藻的生长产生了有效的抑制破坏作用。The toxic effects of three algaecides including copper sulfate,H2O2 and 3-1,1-dimethylurea（DCMU） on the growth of Microcystis aeruginosa were investigated in this paper.The results indicated that the Cu2＋ could promote the growth of the M.aeruginosa at the concentration lower than 10-4mol/L but have toxic effect on M.aeruginosa for both the OD750 and the chlorophyll content decreased continuously to 0 at 94 h when the concentration reaches to 10-4mol/L.When the mass fraction reaching to 0.002‰,the H2O2 possessed a toxic effect on M.aeruginosa within 24 h,but later,the toxic effect for both the OD750 and the chlorophyll content gradually disappeared and recovered to the initial level;Nevertheless,when the mass fraction of H2O2 reaching to 0.004‰,the biomass and chlorophyll content of M.aeruginosa reduced gradually as a result the former decreased to 0 and the later decreased to 0.15 μg/mL at 96 h,showing toxic effect on M.aeruginosa.The 3-1,1-dimethylurea（DCMU） also had a toxic effect on M.aeruginosa at the concentration of 10 μmol/L,under such situation the OD750 and the chlorophyll concentration decreased evidently with the later reduced to 0 at 48 h.

关 键 词：铜绿微囊藻 除藻剂 硫酸铜 二氯苯(基)二甲脲 

分 类 号：TQ225.18[化学工程—有机化工]