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| Accumulation and transfer of mercury and cadmium in ramie from agricultural soils |
| Received:November 14, 2019 |
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| KeyWord:ramie;mercury;cadmium;soil;accumulation |
| Author Name | Affiliation | E-mail | | LIU Chong | Resource and Environmental Engineering College, Guizhou University, Guiyang 550025, China
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHAO Ling | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LI Xiu-hua | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | FU Zhao-cong | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | LIU Fang | Resource and Environmental Engineering College, Guizhou University, Guiyang 550025, China | lfang6435@163.com | | TENG Ying | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | yteng@issas.ac.cn |
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| Abstract: |
| Ramie (Boehmeria nivea L. Gaud)is not only a highly economical and non-edible plant, but also an effective plant for heavy metal remediation. In order to evaluate the remediation efficiency of mercury (Hg)and cadmium (Cd)by ramie, 46 ramie and the corresponding soil samples were gathered from agricultural soils located around a mercury mine near Tongren in Guizhou Province. The amounts of Hg and Cd in ramie and the corresponding soil samples were analyzed. The bioaccumulation factor (BAF)and translocation factor (TF) of Hg and Cd were also calculated. The amount of Hg in the root, stem, skin, and leaves of ramie was in the range of 58.02~136.97, 60.6~560.45, 113.26~3 860.51 μg·kg-1, and 446.1~1 686.3 μg·kg-1, respectively. The amount of Cd in the root, stem, skin, and leaves of ramie was in the range of 10.1~1 527.8, 7.17~1 203.63, 11.57~1 838.14 μg·kg-1, and 77.12~842.41 μg·kg-1, respectively. The amount of Hg was much higher in ramie skin and leaves than in ramie roots. However, the amount of Cd was evenly distributed in the roots, stem, skin, and leaves of ramie. The BAF and TF of Hg were in the range of 0.017~4.826 and 0.583~22.595, respectively. The BAF and TF of Cd were in the range of 0.011~3.725 and 0.055~16.175, respectively. The BAF of Hg was much higher in ramie leaves than in ramie stem and roots. However, there was no significant difference in the BAF of Cd among the roots, stem, skin, and leaves of ramie. The increase in dissolved organic carbon content in the soil led to the decrease in Hg in the stem and skin of ramie, but the decrease in soil pH promoted the uptake and accumulation of Cd in the stem and skin of ramie. |
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