固氮鱼腥藻Anabaena sphaerica和念珠藻Nostoc muscorum对有机氯农药林丹的降解效应和机理  

Lindane degradation by nitrogen fixing Anabaena sphaerica and Nostoc muscorum:Degradation characteristics and mechanisms

作　　者：张杭君[1] 贾秀英[1] 薛大伟[1] 胡赐明[1] 马俊[1] 

机构地区：[1]杭州师范大学生命与环境科学学院,杭州310036

出　　处：《环境科学学报》2010年第5期1057-1061,共5页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金资助项目(No.20707019)~~

摘　　要：研究了固氮鱼腥藻A.sphaerica和念珠藻N.muscorum对林丹(γ-HCH)的降解效应及机理.结果表明,在初始藻种叶绿素含量约为37mg·L-1,林丹起始浓度均为0.2mg·L-1条件下,A.sphaerica和N.muscorum均能明显降解林丹,5d降解率分别为66.1%和69.5%,其降解半衰期分别为3.19和3.23d.在培养过程中,0.2mg·L-1林丹并不会抑制两种固氮藻的生长,培养5d后,叶绿素a的含量分别增加0.82倍和1.36倍.升高温度和增强光照均能增加林丹的降解率.相对于N2,NaNO3作为唯一氮源更能刺激固氮蓝藻对林丹的降解,对于A.sphaerica和N.muscorum,其对林丹的5d降解率分别增加44.6%和40.5%.气质联用检测结果表明,脱去HCl生成γ-五氯环己烯是两种固氮蓝藻降解林丹的主要脱氯分子机理.The degradation of lindane by the nitrogen fixing species Anabaena.sphaerica and Nostoc muscorum was investigated. The removal efficiencies after 5 days for A. sphaerica and N. muscorum were 66.1% and 69.5%,respectively,at the initial concentration of 0.2 mg·L-1. The half-life was 3.19 d for A. sphaerica and 3.23 d for N. muscorum. At an initial concentration of 0.2 mg·L-1,lindane will not inhibit the growth of these cyanobacteria,however,the chlorophyll-a of the cyanobacteria increased 0.82 and 1.36 times,respectively. Both high temperature and high light intensity can increase the degradation rate of lindane. For A. sphaerica and N. muscorum,the removal efficiency can increase 44.6% or 40.5% when NaNO3 or N2 is used as the only nitrogen source. GC-MS analysis demonstrated that the molecular mechanism of lindane degradation in these cyanobacteria involved dechlorination of lindane to γ-pentachlorocyclohexene in the first step.

关 键 词：固氮 鱼腥藻 念珠藻 六六六 脱氯 

分 类 号：X171.5[环境科学与工程—环境科学]