Distribution and Phytoavailability of Potentially Toxic Metals in Different Fe/Mg Mine Tailings

Xuyin Yuan, Yimin Wang, Doudou Tang, Xiaohui Zhang, Lei Zhang and Haiyan Zhang
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Xuyin Yuan: Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Nanjing 210098, China
Yimin Wang: Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Nanjing 210098, China
Doudou Tang: College of Environment, Hohai University, Nanjing 210098, China
Xiaohui Zhang: Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Nanjing 210098, China
Lei Zhang: Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Nanjing 210098, China
Haiyan Zhang: Key Laboratory of Integrated Regulation and Resources Development of Shallow Lakes of Ministry of Education, Nanjing 210098, China

IJERPH, 2018, vol. 15, issue 11, 1-14

Abstract: The environmental risk of potentially toxic metals in tailing soils is of universal concern. We conducted a 3-month pot experiment to research the distribution and variations of potentially toxic metals (PTMs), and the translocation and accumulation capability of these metals (Cr, Ni, Mn, Cu, Zu) in natural plants for three Fe/Mg tailing soils (serpentine-type, olivine-type and magnetite-type) with growth of a grass plant- Imperata cylindrica . We used comparative analysis, regression analysis and correlation analysis to process relevant experimental data. Results showed the rhizosphere tailing soils decreased from 3.70% to 16.8%, compared to the bulk soils, after growth of Imperata cylindrica , and the acid soluble fraction of Mn, Cu and Zn increased significantly. Cu and Zn were more bioavailable than other PTMs, especially for serpentine-type tailing soils. Linear regression analysis indicated that non-residual fractions showed different effects on metal concentrations of Imperata cylindrica . The non-residual metal fractions of serpentine-type and olivine-type tailing soils showed better correlations with metal concentrations in grass plants than those of magnetite-type tailing soils. We found that the chemical compositions of tailing soils showed remarkable effects on Ni and Mn compared with other elements, especially Mg and Al. Overall, the grass plant can alter the metal distribution, enhance metal bioavailability and promote land use of Fe/Mg tailing soils.

Keywords: potential toxic metal; Fe/Mg mine tailings; Imperata cylindrica; metal fraction; phytoavailability (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2018
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