标题: Toxic responses of freshwater microalgae Chlorella sorokiniana due to exposure of flame retardants

作者: Liu, DY (Liu, Dongyang); Qv, MX (Qv, Mingxiang); Dai, D (Dai, Dian); Wang, X (Wang, Xu); Zhu, LD (Zhu, Liandong)

来源出版物: CHEMOSPHERE卷: 310文献号: 136808 DOI: 10.1016/j.chemosphere.2022.136808出版年: JAN 2023

摘要: Flame retardants, such as Tetrabromobisphenol A (TBBPA), Tris(1,3-dichloro-2-propyl) phosphate (TDCPP) and tributyl phosphate (TBP), are frequently detected in surface water. However, the effects of FRs exposure on aquatic organisms especially freshwater microalgae are still unclear. In this study, the toxicities of TBBPA, TDCPP and TBP to microalgae Chlorella sorokiniana, in terms of growth inhibition, photosynthetic activity inhibition and oxidative damage, were investigated, and according ecological risks were assessed. The results showed that TBBPA, TDCPP and TBP had inhibitory effects on C. sorokiniana, with 96 h EC50 (concentration for 50% of maximal effect) values of 7.606, 41.794 and 49.996 mg/L, respectively. Fv/Fm decreased as the increase of exposure time under 15 mg/L TBBPA. Under 50 mg/L TDCPP and 80 mg/L TBP exposure, Fv/Fm decreased significantly after 24 h. However, Fv/Fm rose after 96 h, indicating that the damaged photosynthetic activity was reversible. The content of chlorophyll a decreased, as the increase of TBBPA concentration from 3 to 15 mg/L. However, chlorophyll a increased first and then decreased, as the increase of TDCPP and TBP concentrations from 0 to 50 mg/L and 0-80 mg/L, respectively. Results indicated that C. sorokiniana could use the phosphorus of TDCPP and TBP to ensure the production of chlorophyll a. The risen content of reactive oxygen species, malondialdehyde as well as superoxide dismutase activity indicated that exposure to FRs induced oxidative stress. Additionally, the risk quotients showed that tested FRs had ecological risks in natural waters or wastewaters. This study provides insights into the toxicological mechanisms of different FRs toward freshwater microalgae for better understanding of according environmental risks.

作者关键词: Toxicity; Chlorella sorokiniana; Flame retardants; Oxidative damage; Ecological risks

地址: [Liu, Dongyang; Qv, Mingxiang; Dai, Dian; Wang, Xu; Zhu, Liandong] Wuhan Univ, Sch Resources & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Hubei Key Lab Biomass Resources Chem & Environm B, Wuhan 430079, Peoples R China.

[Liu, Dongyang; Zhu, Liandong] Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.

通讯作者地址: Wang, X; Zhu, LD (通讯作者)，Wuhan Univ, Sch Resources & Environm Sci, Hubei Int Sci & Technol Cooperat Base Sustainable, Hubei Key Lab Biomass Resources Chem & Environm B, Wuhan 430079, Peoples R China.

Zhu, LD (通讯作者)，Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Peoples R China.

电子邮件地址: xu.wang@whu.edu.cn;ldzhu@whu.edu.cn

影响因子：8.8