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| Effects of three kinds of chelating agents on U and Cd phytoremediation in Brassica juncea L. |
| Received:January 04, 2018 |
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| KeyWord:chelating agent;Brassica juncea L;uranium;cadmium;bioaccumulation |
| Author Name | Affiliation | E-mail | | CHEN Li | College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China | | | WANG Dan | College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China | wangdan@swust.edu.cn | | LONG Chan | College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China | | | CUI Zheng-xu | College of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang 621010, China | |
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| Abstract: |
| To explore the effects of chelating agents on phytoremediation in U-Cd contaminated soil, a pot experiment was performed to study the effects of 3 chelating agents(EDDS, OA, and CA)and their additive concentrations(0, 2.5, 5.0, and 7.5 mmol·kg-1)on U and Cd extraction, translocation, and accumulation in Brassica juncea L. The growth of B. juncea was affected by the type and concentration of chelating agents. EDDS was strongly toxic to B. juncea and its positive effects increased with concentration. The application of 2.5 mmol·kg-1 OA and CA increased the net weight of B. juncea. The addition of 7.5 mmol·kg-1 OA and CA inhibited the growth of B. juncea. The chelating agents had a positive effect on U and Cd uptake and translocation in B. juncea. Applying 7.5 mmol·kg-1 CA maximally increased the U content by 6.03 times and 2.84 times of the original aboveground and total content, with levels of 9.71 mg·kg-1 and 20.63 mg·kg-1, respectively, attained. Applying 5.0 mmol·kg-1 EDDS increased the Cd content by 4.67 times and 2.35 times the original aboveground and total content, with levels of 382.2 mg·kg-1 and 328.2 mg·kg-1, respectively, attained. The maximum value of the U translocation factor(0.118)was achieved when CA concentration was 7.5 mmol·kg-1, 2.93 times that of CK. EDDS had the greatest effect on the transport of Cd. Based on the results of U and Cd bioaccumulation, it was concluded that CA had the greatest effect on the accumulation of U, while EDDS had the greatest effect on the accumulation of Cd and also affected that of U. The addition of CA and EDDS, respectively, enhanced the available content of U and Cd in soil. These results suggested that chelating agents could improve the efficiency of phytoremediation with B. juncea in soil contaminated with U and Cd. |
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