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| Cd hyperaccumulation and accumulative kinetics of Celosia argentea Linn.for phytoremediation of Cd-contaminated soil |
| Received:December 30, 2016 |
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| KeyWord:Celosia argentea Linn;hyperaccumulator;cadmium;phytoremediation |
| Author Name | Affiliation | E-mail | | YAO Shi-yin | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | LIU Jie | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | liujie@glut.edu.cn | | WANG Yi-xuan | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | ZHU Yuan-fang | Guangxi Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China | | | FENG Shun | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| In the present work, Cd tolerance and accumulation in Celosia argentea were evaluated using pot experiments with soils spiked with different levels(0, 1, 5, 10, 15, 20, and 25 mg·kg-1) of Cd or different Cd compounds[CdCl2, CdSO4, CdCO3, Cd(OH)2, CdS, CdO, and Cd(NO3)2] at 5 mg·kg-1. Kinetics of Cd uptake and accumulation in the plants were also studied in natural Cd-contaminated soil. The results showed that C. argentea has a high ability to accumulate and tolerate Cd. The biomass of C. argentea did not decrease significantly when the soil Cd was ≤ 15 mg·kg-1. The Cd accumulation in leaves was above 100 mg·kg-1, and the transfer factor and bioconcentration factor were both higher than 1 in all plants except for control. Therefore, C. argentea could be identified as a Cd-hyperaccumulator. In addition, C. argentea can hyperaccumulate not only soluble Cd but also insoluble Cd. Cd concentrations were 134, 102, and 90.2 mg·kg-1 in the leaves of C. argentea grown in the soils with exogenous Cd(OH)2, CdS, and CdO, respectively. This finding indicated that C. argentea has a potential to remediate soils contaminated by different Cd species. In general, the concentrations of Cd in tissues increased progressively with time. However, the uptake of Cd in shoots increased insignificantly from the 8th to the 12th week(P>0.05), indicating that the 8th week is the best harvest time for C. argentea. A short harvest time is favorable to improve the efficiency of phytoremediation. In conclusion, C. argentea has a great potential for Cd phytoextraction because of its rapid growth, considerable biomass, and high Cd tolerance and accumulation. |
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