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- Title
Ex situ phytoremediation trial of Sardinian mine waste using a pioneer plant species.
- Authors
Boi, Maria Enrica; Cappai, Giovanna; De Giudici, Giovanni; Medas, Daniela; Piredda, Martina; Porceddu, Marco; Bacchetta, Gianluigi
- Abstract
The mitigation of metals contamination is currently a crucial issue for the reclamation of mine sites. Indeed, mine wastes are often disposed in open dumps and consequently pollutants are subjected to dispersion in the surrounding areas. In this study, the potential use of Helichrysum microphyllum subsp. tyrrhenicum for phytostabilization was evaluated in ex situ conditions. Ninety specimens were randomly selected and were planted in three substrates (reference substrate, mine waste materials, and mine wastes with compost). Mineralogical compositions of substrates, rhizosphere, and roots were assessed through X-ray diffraction (XRD). Zn, Pb, and Cd concentrations of substrates, rhizosphere, soil pore waters, and plant tissues were determined. The phytostabilization potential was determined through the application of biological accumulation coefficient (BAC), biological concentration factor (BCF), and translocation factor (TF). Moreover, survival and biometric parameters were assessed on plant specimens. The polluted substrates and related rhizosphere materials were mainly composed of dolomite, quartz, pyrite, and phyllosilicate. Zn was the most abundant metal in substrates, rhizosphere, and soil pore waters. XRD analysis on roots showed the presence of amorphous cellulose and quartz and Zn was the most abundant metal in plant tissues. H. microphyllum subsp. tyrrhenicum restricts the accumulation of the metals into roots limiting their translocation in aereal parts, indicating its potential use as phytostabilizer (BCF, BAC, TF < 1). Survival and growth data showed a great adaptability to different substrates, with an evident positive effect of the implementation of compost which increased the plant survival and decreased the metals uptake into roots.
- Subjects
MINE waste; PLANT species; BOTANICAL specimens; WASTE products; BIOACCUMULATION; DOLOMITE; PYRITES; QUARTZ
- Publication
Environmental Science & Pollution Research, 2021, Vol 28, Issue 39, p55736
- ISSN
0944-1344
- Publication type
Article
- DOI
10.1007/s11356-021-14710-y