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研究报告

基金项目：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（EC₅₀）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.

Abstract：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 (EC₅₀) is 7.047 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.

Key words：nano-sized BiOBr Pseudokirchneriella subcapitata growth inhibition photosynthesis pigments oxidation stress