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| Contribution of Iris pseudacorus to atrazine dissipation in water： Effects of initial atrazine concentrations |
| Received:May 14, 2020 |
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| KeyWord:water pollution;Iris pseudacorus;atrazine;dissipation |
| Author Name | Affiliation | E-mail | | WANG Qing-hai | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | XIA Fan | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China | | | LI Cui | Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | QUE Xiao-e | Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China | quexiaoe@sina.com |
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| Abstract: |
| Based on a 35 d hydroponic experiment, the phytoremediation potential of emergent plants for atrazine (ATZ)was evaluated by investigating the contribution of Iris pseudacorus to ATZ dissipation in culture solution at different initial levels (0.5, 1.0, 2.0, and 4.0 mg·L-1)and the translocation and distribution of ATZ in plants under sterilized (culture solutions with the addition of ampicillin)and unsterilized conditions. The results showed that the dissipation rate of ATZ decreased significantly with increasing initial ATZ concentrations. The initial ATZ concentration, microorganisms, and plants had significant influences on the ATZ dissipation rate; their order of importance according to the decreasing effect on the ATZ dissipation rate was the initial ATZ concentration, microorganisms, and plants. The contribution rate of plants to ATZ dissipation in non-sterile conditions (34%~49%)was significantly higher than that in sterile conditions. The contribution rate of microorganisms in treatments without plants (28%~41%)was significantly lower than that in treatments with plants. The initial ATZ concentration had no significant effect on the plant contribution to pollutant removal at concentrations up to 4 mg·L-1 (P=0.371), but had a significant effect on the microorganism contribution to pollutant removal (P=0.039). I. pseudacorus can absorb ATZ and transport it from the roots to the shoots, and the ATZ content in plants is positively correlated with the initial ATZ concentration. Furthermore, ATZ can be degraded in plants. Thus, I. pseudacorus is a plant species with a great contribution to ATZ removal from water, and can serve as a promising phytoremediation agent. |
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