1. 桂北典型锰矿区周边土壤重金属污染状况及主要植物富集特征.
- Author
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王新帅, 林 华, 俞 果, 蒋萍萍, and 刘 杰
- Subjects
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HEAVY metal toxicology , *HEAVY metals removal (Sewage purification) , *BOK choy , *SOIL pollution , *FOOD crops , *SOIL remediation , *HEAVY metals , *RHIZOSPHERE - Abstract
In order to assess the heavy metal pollution of soils and crops around a typical manganese mine tailing in North Guangxi, and to select suitable plant materials for the remediation of heavy metal pollution in this area, nine crop samples, 23 dominant plant species and their rhizosphere soils, were collected. The contents of Cd, Mn, Cr, Pb and Zn of the samples were analyzed. The ecological risks of heavy metals in the soils and crops were evaluated using the single factor and comprehensive pollution index. The bioconcentration and translocation factors of the dominant plant species were calculated. The results were as follows:(1)Cd and Mn were the dominant pollutants in the soils of the studied area. The values of single factor pollution index of Cd and Mn reached 18.53 and 147.09 respectively. (2)The contents of Cd, Cr and Pb in crops such as Arachis hypogaea and Brassica chinensis exceeded the threshold values in the National Food Safety Standards(GB 2762—2017), which had great health risks.(3)Among the 23 dominant plant species, thetranslocation factors of Celosia argentea, Bidens pilosa, Emilia sonchifolia and Eremochloa ciliaris for several heavy metals were greater than one, indicating that they have the characteristics of metal accumulating plants. The heavy metal contents in roots of Arisaema erubescens, Ricinus communis, and Senecio scandens were relatively higher, while their translocation factors were relatively lower, indicating that they were root hoarding plant. The metal contents in the shoots and roots of Crotalaria albida, Rottboellia exaltata and Sonchus arvensis were relatively lower, while they kept healthy in the contaminated soil, indicating that they were elusive plants. The results show that the soils in the studied area are seriously polluted by Cd and Mn, and Celosia argentea is a potential plant material for the remediation of the co-contaminated soil. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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