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| The influence of submersed macrophytes on the migration of atrazine in water |
| Received:November 15, 2015 |
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| KeyWord:atrazine;distribution;sediments;Potamogeton crispus;Myriophyllum spicatum |
| Author Name | Affiliation | E-mail | | QU Meng-jie | Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | LI Hui-dong | Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
Institute of Quality Standard and Testing Technology, Shandong Academy of Agricultural Sciences, Jinan 250100, China | | | LI Na | Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | ZHANG Meng | Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | | | ZHU Duan-wei | Laboratory of Eco-Environmental Engineering Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China | zhudw@mail.hzau.edu.cn |
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| Abstract: |
| This paper researched the distribution, adsorption and desorption behaviors of atrazine in the sediment-water system of Lake Tangxunhu and Lake Nanhu in Wuhan City, and Lake Honghu in Jingzhou City, China, concluding that KPd, the desorption equilibrium distribution coefficient of atrazine in this system, is much higher than the adsorption equilibrium distribution coefficient KP. In other words, its hysteretic desorption behavior is obvious, and this suggests that atrazine will be hard to desorb once it enters into sediments. On this basis, Potamogeton crispus and Mriophyllum spicatum, two submerged plants that could absorb atrazine, were cultivated in the sediments in Lake Nanhu, and the initial concentration of atrazine was set equal to 0.10 mg·kg-1, 0.25 mg·kg-1 and 0.50 mg·kg-1. Both of the plants can directly absorb atrazine. When the initial concentration equaled 0.25 mg·kg-1 on the 20th day, the concentration of the atrazine in P. crispus and M. spicatum was equal to 13.4 mg·kg-1 and 11.2 mg·kg-1 respectively. Moreover, both plants have a certain removal effect on atrazine in water. After 45 d, as the concentration increased, the removal rate of the atrazine in the sediments by P. crispus and M. spicatum reached 92%, 86% and 91% as well as 84%, 82% and 90%. On the 60 d, the degradation rate of the atrazine in the overlying water reached 35.0%, 51.3% and 1.50% as well as 32.4%, 61.8% and 0.44%. Results show that even though the residue of atrazine in water is easily immobilized by sediments, macrophytes can still be properly applied in a specific concentration range to the removal of atrazine. |
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