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| Simulation Study on Dynamics of Trifluralin Degradation in Aquaculture Water |
| Received:July 08, 2014 |
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| KeyWord:trifluralin;aquaculture;water body;environment;degradation dynamic;simulation |
| Author Name | Affiliation | E-mail | | JI Li | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China | | | ZHANG Qian-yue | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China | | | YAN Tao | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China | | | WU Wei | Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, China
Freshwater Fisheries Research Center, Key Laboratory of Inland Fishery Eco-environment and Resource, Chinese Academy of Fishery Sciences, Wuxi 214081, China | wuw@ffrc.cn |
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| Abstract: |
| Trifluralin is widely used to control pond moss, and prevent and cure shrimp diseases in shrimp aquaculture industry. It is critical to understand its residual and degradation in aquaculture environment. Here a method based on existing methods was established to test the concentrations of trifluralin in aquaculture water using gas chromatography. Its detection limit was 0.000 105 mg·L-1 and low limit 0.000 42 mg·L-1, with the recovery rate of 82.88%~108.19% at 0.025~2.0 mg·L-1 of standard addition. This method could be used to accurately monitor dynamics of trifluralin in aquaculture. The half-life of trifluralin was within 35 days in aquaculture water. Initial concentration, water temperature and illumination time were important factors affecting trifluralin degradation, while pH had no significant effect on the degradation. Higher temperature(30 ℃) and longer exposure time(>12 h·d-1, 2500 lx) could accelerate the degradation of trifluralin at the concentrations of 0.05~0.5 mg·L-1. Trifluralin at 0.05 mg·L-1 was a safe concentration for the quality and safety of aquatic products. The withdrawal time for trifluralin was 1050 ℃·d. |
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