纳米BiOBr对羊角月牙藻的毒性效应  

Toxic effects of nano-sized BiOBr on Pseudokirchneriella subcapitata

作　　者：程晓燕 赵新仕 叶立群[1] 马照宇 李玉英[1] 付玲[1] 姚伦广[1] CHENG Xiaoyan;ZHAO Xinshi;YE Liqun;MA Zhaoyu;LI Yuying;FU Ling;YAO Lunguang(Henan Key Laboratory of Ecological Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province,Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province,College of Agricultural Engineering,Nanyang Normal University,Nanyang 473061)

机构地区：[1]南阳师范学院南水北调中线水源区水安全河南省协同创新中心河南省南水北调中线水源区生态安全重点实验室,南阳473061

出　　处：《环境科学学报》2018年第10期4176-4184,共9页Acta Scientiae Circumstantiae

基　　金：河南省教育厅项目(No.16A330004);南阳师范学院博士专项项目(No.ZX2016003);河南省科技厅项目(No.182102310609);河南省科研服务平台专项(No.2016151);河南省南水北调中线水源区水生态安全创新型科技团队专项资助(No.17454);国家自然科学基金(No.U1404216;21603109;51502146)~~

摘　　要：纳米BiOBr(n-BiOBr)是具有广泛应用前景的高活性光催化材料,由于n-BiOBr能在可见光区响应,一旦进入水环境将会造成严重的水生态安全隐患.为探究n-BiOBr对藻类的毒性效应及机理,以羊角月牙藻(Pseudokirchneriella subcapitata)为受试生物,研究n-BiOBr对羊角月牙藻生长状况、光合色素、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)及脂质过氧化物丙二醛(MDA)的影响.结果表明,n-BiOBr对羊角月牙藻的生长有抑制作用,72 h半数效应浓度(EC_(50))为7.407 mg·L^(-1). n-BiOBr处理藻细胞72 h后,藻细胞的叶绿素总量及叶绿素a/b值随着n-BiOBr浓度的升高而降低,呈现一定的浓度-效应关系.随着n-BiOBr浓度增加,MDA、SOD和CAT活性呈现"升高-降低"的趋势.本研究可为纳米材料的科学、有效、无害化应用和管理提供理论依据.Nano-sized BiOBr（ n-BiOBr） is a highly active photocatalyst with diverse applications. Because of its response to visible light,discharged n-BiOBr can pose potential risk to water ecosystems. In this paper,freshwater green algae（ Pseudokirchneriella subcapitata） was selected as a model organism and the effects of n-BiOBr on growth,photosynthesis pigments,superoxide dismutase（ SOD）,catalase（ CAT）,and malondialdehyde（ MDA）of the algae were investigated. The results showed that the n-BiOBr can strongly inhibit growth of P. subcapitata and 50% effective concentration（ EC（50）） is7.047 mg·L-1 during 72 h exposure period. After 72 h treatment,the total content of chlorophyll a and b and their ratio（ a/b） were both decreased with the increase of n-BiOBr concentrations. At the same time,the activities of SOD and CAT,as well as the content of MDA,showed a＂Bell-shaped curve＂,i.e.,increasing at first and then decreasing. These results are valuable for the risk assessment of nano-sized BiOBr in aquatic environment.

关 键 词：纳米BiOBr 羊角月牙藻 生长抑制 光合色素 氧化压力 

分 类 号：X171.5[环境科学与工程—环境科学]