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| The migration and transformation characteristic of niclosamide in plant-soil system |
| Received:May 10, 2017 |
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| KeyWord:niclosamide;rhizosphere soil;plant-soil system;microorganism;migration;transformation |
| Author Name | Affiliation | E-mail | | LUO Cui | School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China | | | HUANG Yi-yang | College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China | | | HUANG Dong-gen | School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China | dghuang1017@163.com | | LIU Miao | School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China | | | XIONG Wei | School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China | | | GUO Qin | School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China | | | YANG Tian-zi | School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China | |
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| Abstract: |
| Approximate 200 tons of niclosamide was directly added to Poyang Lake basin for snail control each year. Its degradation depends entirely on the natural environment, and it can influence the regional ecological environment. This study evaluated the migration and transformation properties of niclosamide in Poyang Lake plant-soil system by pot plant experiment. The results showed that the degradation of niclosamide in rhizosphere soil followed the first order kinetics equation, and the estimated half-lives were 14.6, 18.3, 21.7 d, respectively in Carex, Artemisia selengensis and blank soil. Plant roots could promote the degradation of niclosamide and niclosamide degraded to form a series of aromatic intermediates. The niclosamide residues in the rhizosphere soil had significant negative correlation (P<0.05) with microbial population. Moreover, it was bacteria in Carex rhizosphere soil and actinomycetes in Artemisia selengensis rhizosphere soil lead the key role in process of niclosamide degradation. Niclosamide residues and intermediate concentration in Carex and Artemisia selengensis were various along with time. The largest residual concentration of niclosamide was 2.47 mg·kg-1 in Artemisia selengensis aerial part after cultivating 10 d, and it was 0.99 mg·kg-1 in Artemisia selengensis root part after cultivating 10 d. The largest residual concentrations of niclosamide in Carex aerial and root part were 1.7 and 1.0 mg·kg-1 respectively, and both appeared after cultivating 6 d. Our research indicated that niclosamide and intermediate products remained long in plants, which had some risk for edible plants. |
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