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The Optimal Selection of Remediation Plants for Cd Contaminated River Sediment
SHEN Jiayi, ZANG Xueke, ZHANG Changsong, GAO Bingjie, GAO Mingjing, LI Xinyi, ZHANG Xinying
Journal of Shanghai University(Natural Science Edition)
2024, 30 (1):
86-093.
DOI: 10.12066/j.issn.1007-2861.2336
Twelve plants were selected to conduct an experimental study on remediation
of Cd contaminated sediment of black-odor river in Shanghai. Tolerance, enrichment and
translocation features, and remediation efficiencies of plants to the heavy metal were investigated, with a view to find practical application of phytoremediation of river sediments polluted by Cd. Results revealed that all the plants except the transplanted Juncus effusus L.
showed good tolerance to the sediment. The above-ground Cd contents of Solanum nigrum
L., Juncus effusus L., Calendula officinalis L., Hylotelephium erythrostictum (Miq.) H. Ohba, and Farfugrium japonicum (L. f.) Kitam. were higher than 4.50 mg/kg. The bioaccumulation factors (BCFs) and translocation factors (TFs) of Cd in Abutilon theophrasti
Medicus, Juncus effusus L., Calendula officinalis L., Hylotelephium erythrostictum (Miq.)
H. Ohba, Farfugrium japonicum (L. f.) Kitam. and Phytolacca americana L. were greater
than 1. The extraction amounts of Cd in Solanum nigrum L., Calendula officinalis L.,
Phytolacca americana L. and Bidens pilosa L. were higher than 0.30 kg/hm2, and had
relatively good remediation effects. Among the plants, the extraction amount and extraction efficiency of Solanum nigrum L. for Cd in the sediment were up to 2.84 kg/hm2 and
88.75%, respectively, indicating great remediation potential. The optimization test proved
that Solanum nigrum L., as the best remediation plant, could be used to remediate the Cd
contaminated river sediment in this area.
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