过氧化氢催化氧化水中有机污染物的生产性试验研究
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2020-02-26 12:24:30
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浙江大学学报(农业与生命科学版)40(3):322~329,2014JournalofZhejiangUniversity(Agric.8LLifeSc[.、http://www.journals.zju.edu.cn/agrE-mail:zdxbnsb@zju.edu.cnDOI:10.3785/j.issn.1008—9209.2013.07.051禾草灵对铜绿微囊藻氧化应激及藻毒素释放的影响叶碌,刘超男,刘维屏孙(1.上海应用技术学院化学与环境工程学院,上海2O1418;2.浙江大学环境与资源学院,杭州310058)摘要以铜绿微囊藻(Microsystisaeruginosa)作为生物模型,通过测定藻细胞氧化损伤程度与藻细胞内外藻毒素LR(microcystin-LR,MC~LR)的含量,研究除草剂禾草灵的生态毒性.结果表明,禾草灵在实验室处理质量浓度1,2。5mg/L下,能诱导铜绿微囊藻细胞活性氧(reactiveoxygenspecies,R0S)的产生,引起细胞脂质过氧化水平丙二醛(ma10ndia1dehyde,MDA)的提高和超氧化物歧化酶(superoxidedismutase,SOD)的活性增强.说明禾草灵对铜绿微囊藻产生了氧化胁迫.5mg/L禾草灵使铜绿微囊藻释放到细胞外的微囊藻毒素MC—LR显著增加,为空白对照的68.5,2.11,2.50,123.67倍(第2,3,4,5天);细胞内MC-LR含量与空白对照相比有一定的降低,为空白对照的0.34,0.82,2.76,0.11倍(第2,3,4,5天).说明禾草灵在一定质量浓度下能对铜绿微囊藻产生氧化胁迫,引起藻细胞脂质过氧化,从而引起细胞膜损伤,导致微囊藻毒素MC-LR更多的释放到水体中,对水环境造成一定的影响.实验结果可对禾草灵的环境安全评价提供一定的参考.关键词除草剂;蓝藻;氧化应激;微囊藻毒素LR中图分类号S482.4;X503.23文献标志码AEffectsofherbicidediclofop—methylonoxidativestressandmicrocystinreleaseincyanobacteriumMicrosystisaeruginosa.JournalofZh@angUniversity(Agric.&LifeSci.),2014,40(3):322—329YeJing,LiuChaonan,LiuWeiping(1.SchoolInstituteofTechnology,Shanghai201418,China2University,Hangzhou310058,China)ofChemicalandEnvironmentalEngineering,ShanghaiCollegeofEnvironmentalandResourceSciences,ZhejiangSummaryDiclofop—methylisapostemergenceherbicideintroducedinthe1960s.Itiswidelyusedonwheat,barley,andgolfcourses(turf)allovertheworld.Residuesofdiclofop—methylmaypollutethewatersystemandaffectthephysiologicalprocessesincyanobacteria.Causativecyanobacteriacanoftencauseseriousenvironmental,aesthetic,andeconomicproblems;besides,itcanproducemicrocystins(MCs)whicharetoxictodomesticlivestockandwildlife.CertainenvironmentalfactorssuchaspH,temperature,andtheamountofnitrogenandphosphorusinthewaterhavebeenfoundtoaffecttheproductionofMCs.Butotherfactors,suchastheconcentrationofenvironmentalpollutantsincludingpesticideresidueswhichmaybeprevalentinaquaticecosystems,havenotbeenstudiedinsufficientdetail.Inthecurrentstudy,oxidativedamageandtoxinreleasefromMicrosystisa'eruginosacausedbydiclofop—methylwe
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