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| Ecotoxicological effects of triclosan on Hydrilla verticillata in sediments |
| Received:January 13, 2019 |
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| KeyWord:triclosan;Hydrilla verticillata;sediment exposure;ecological toxicity |
| Author Name | Affiliation | E-mail | | ZHANG Li-na | Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | WANG Zhi-yin | School of Resources and Civil Engineering, Northeastern University, Shenyang 110016, China | | | AN Jing | Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China | anjing@iae.ac.cn |
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| Abstract: |
| Chronic toxicity of triclosan (TCS)on submerged plant Hydrilla verticillata in sediments with 0.05~0.5 mg·kg-1 TCS was studied. TCS concentration, chlorophyll content, soluble protein content, and antioxidant enzyme activities in H. verticillata were determined using HPLC-MS and UV-VIS techniques. The results showed that TCS concentration in the leaves of H. verticillata in treatment groups was low in the early exposure stage (14 d). However, bioaccumulation of TCS increased with exposure time; its concentration in the leaves was 2.16 mg·kg-1 for 0.5 mg·kg-1 TCS sediment in 28 d. During the TCS exposure period, the chlorophyll content in the leaves of H. verticillata decreased continuously in the TCS treatment groups in comparison to the control group. The soluble protein content in H. verticillata leaves first increased and then declined with increasing exposure time, whereas in the plant stems it was inhibited significantly during the entire TCS exposure period. Furthermore, TCS had significant influences on H. verticillata antioxidant enzyme system (CAT, SOD, and POD activities), which led to plant damage. The current findings will provide fundamental data for evaluating the risk and toxicity of TCS to the aquatic ecosystems. |
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