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Frontiers in Biology

ISSN 1674-7984

ISSN 1674-7992(Online)

CN 11-5892/Q

Front Biol    2013, Vol. 8 Issue (6) : 599-605    https://doi.org/10.1007/s11515-013-1274-y
SHORT COMMUNICATION
Cleaning up of heavy metals-polluted water by a terrestrial hyperaccumulator Sedum alfredii Hance
Boxia CHEN, Wenli AI, Huan GONG, Xiang GAO(), Baosheng QIU
Hubei Key Laboratory of Genetic Regulation and Integrative Biology, College of Life Sciences, Central China Normal University, Wuhan 430079, China
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Abstract

Sedum alfredii Hance is a terrestrial zinc/cadmium (Zn/Cd)-hyperaccumulating and lead (Pb)-accumulating plant. Previous studies on S. alfredii were mostly focused on its physiological mechanism of heavy metal uptake and the application in phytoextraction of metals from contaminated soils. In this study, we evaluated the application potential of S. alfredii in the cleanup of heavy metals from contaminated lake water. Our research revealed that changing pH in lake water would not make particular difference on the final accumulation amount of heavy metals, because the acidic water environment negatively affected plant growth compared with the neutral and alkaline environments, but was more conducive for heavy metal absorption and accumulation. In addition, S. alfredii showed an increase of approximately 2.2-fold in dry weight (DW) when cultured with lake water for 25 d. At the same time, it accumulated approximately 5.0 mg/kg DW of Cd and 41.4 mg/kg DW of Pb. The absorption of heavy metals was highly effective during the first 10 d of culture. Also, the quality of lake water was greatly improved after only 2-d cleanup by S. alfredii. In general, this hyperaccumulator exhibits great potential for application in the cleanup of heavy metals-polluted waters.

Keywords heavy metals      hyperaccummulator      lake water      phytoremediation      Sedum alfredii     
Corresponding Author(s): GAO Xiang,Email:ggxx2002@126.com   
Issue Date: 01 December 2013
 Cite this article:   
Wenli AI,Boxia CHEN,Huan GONG, et al. Cleaning up of heavy metals-polluted water by a terrestrial hyperaccumulator Sedum alfredii Hance[J]. Front Biol, 2013, 8(6): 599-605.
 URL:  
https://academic.hep.com.cn/fib/EN/10.1007/s11515-013-1274-y
https://academic.hep.com.cn/fib/EN/Y2013/V8/I6/599
Lakes and criterionContent (μg/L)
CdPbZn
Donghu Lake8.6097.9766.44
Moshui Lake12.3279.3335.41
Jinying Lake8.3483.1021.52
GB3838-2002 (III)*5501000
Tab.1  Contents of three heavy metals in surface water near the shores of urban lakes of Wuhan City, China
Fig.1  plants cultured with lake water in this experiment.
Fig.2  Growth changes in the above-ground parts (a) and roots (b) of in MS solution at various pH values for 20 d. Data are expressed as mean±SD ( = 4).
Fig.3  Cd accumulation in the above-ground parts of after being exposed to low (25 μM) and high (100 μM) Cd solutions with different pH values for 16 d. Data are expressed as mean±SD ( = 4).
Fig.4  Growth of the above-ground parts of after being cultured with 1/10 MS medium and lake water for 25 d. Data are expressed as mean±SD ( = 3).
Fresh lake waterCleaned lake waterTap water
pH7.92±0.047.41±0.127.07±0.09
ORP (mV)382±11414±7412±7
TDS (g/L)0.4±0.00.3±0.00.2±0.0
DO (g/L)7.50±0.087.67±0.108.10±0.02
NH4+ (mg/LN)0.30±0.020.07±0.010.04±0.00
NO3- (mg/LN)0.36±0.010.26±0.020.22±0.01
Cl- (mg/L)60±250±240±1
PO43-(mg/LP)*0.28±0.050.19±0.100.02±0.01
Tab.2  Changes in the quality of water from Donghu Lake after cleanup by plants
Fig.5  Accumulation of Cd (a) and Pb (b) in the above-ground parts of after being cultured with lake water. 1/10 MS medium was used as control solution. Data are expressed as mean±SD ( = 4).
Fig.6  Water from Donghu Lake before and after cleanup by . (a) Fresh water collected from Donghu Lake. (b) Water after cleanup by for 2 d. (c) Still lake water stored for 2 d.
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