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Characteristics of heavy metals accumulation and their chemical forms found for Polygonum viviparum and Rumex nepalensis in the remediation area of abandoned uranium mine(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 03
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Characteristics of heavy metals accumulation and their chemical forms found for Polygonum viviparum and Rumex nepalensis in the remediation area of abandoned uranium mine
LI Ruofei1 DONG Faqin1 2** YANG Gang1 ZHANG Wei3 & LIU Mingxue1
1 School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China 2 Key Laboratory of Solid Waste Treatment and Resource Recycling of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China 3 State Key Laboratory of Environment-friendly Energy Materials, Mianyang 621010, China
polymetallic pollution uranium tailing phytoremediation chemical form Polygonaceae
X53 : X173

We studied the accumulation process of uranium and several other heavy metals, as well as their actual chemical forms in plant tissues, in Polygonum viviparum and Rumex nepalensis, which are dominant Polygonaceae plant species growing in the remediation area of the Zogie uranium mine. The results of this study will contribute to a better understanding of heavy metal absorption and tolerance by plants around polluted areas, which is important for improving remediation efficiency. The composition of heavy metals in P. viviparum and R. nepalensis were analyzed through field sampling. Their subsequent extraction from the sample using a special chemical separation method allowed to determine their chemical nature regarding their qualitative state of binding in the plant. The results showed that the soil in the remediation area was polluted by U, Cd, As, Zn, and Cu. The areas of contamination in declining order is as follows: I (open-pit mining site) > II (artificial restoration area) > III (affiliated river). Single factor index and Nemerow comprehensive pollution index showed that serious heavy metal pollution existed in open-pit mining sites and artificial restoration areas. Furthermore, Zn, Cd, Cu, and Pb in the plant samples exceeded the normal values. The bio-enrichment coefficient (BCF) and transfer factor (TF) of R. nepalensis were determined to be 16.03 and 1.11, respectively, and in P. viviparum, the values were 14.85 and 3.83, respectively. This indicates that both plants are suitable for use in ecological remediation of uranium-contaminated soil. Because uranium in R. nepalensis was mainly extracted with deionized water, organic acids might be the complexing ligand for uranium in the plants. For the other heavy metals, acetate and hydrochloric acid were mainly needed for their extraction from R. nepalensis, which means that they should have stronger ligands. In contrast, most of the heavy metals in P. viviparum could be extracted with hydrochloric acid, acetic acid, and sodium chloride. Both P. viviparum and R. nepalensis could be used for heavy metal remediation around a uranium mine. The plants show good tolerance and absorption properties for uranium and other heavy metals, such as Cd, in the investigated remediation area. The heavy metals found in these plants mentioned above are relatively strongly bound to their ligands, which indicates that both Polygonaceae plant species can cope with uranium and other heavy metal stressors.


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Last Update: 2019-06-25