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PHYTOREMEDIATION OF MULTI-METAL CONTAMINATED MINE TAILINGS WITH SOLANUM NIGRUM L. AND BIOCHAR/ATTAPULGITE AMENDMENTS
Li, X., X. Zhang, X. Wang, and Z. Cui.
Ecotoxicology and Environmental Safety 180:517-525(2019)
An enhanced phytoremediation technique using Solanum nigrum L. and two soil amendments (10% biochar [MB2] and 10% attapulgite [MA2]) was greenhouse tested on multi-metal contaminated mine tailings. Plant length and fresh weight in the MA2/MB2-applied treatments were significantly higher than those in the non-amended treatment, indicating MA2 and MB2 amendments could alleviate metal phytotoxicity. MA2 and MB2 application decreased metal uptake in plant leaves but increased metal uptake in plant roots, suggesting that MA2 and MB2 had significant enhancement on metal stabilization. Temporal variation of metal translocation in the soil-to-plant system showed that the function of MA2 and MB2 nearly reached a plateau in seven months. The removal rates of metals were higher after the application of MA2 than MB2, and by the following order: Cu (39.6%) > Zn (35.0%) > Cd (34.1%) > Hg (32.1%) > Pb (31.8%) > Mn (19.1%). The synergistic effect between S. nigrum L. and MA2/MB2 appeared to be particularly effective in terms of metal phytostabilization, and MA2 was superior to MB2.
Ecotoxicology and Environmental Safety 180:517-525(2019)
An enhanced phytoremediation technique using Solanum nigrum L. and two soil amendments (10% biochar [MB2] and 10% attapulgite [MA2]) was greenhouse tested on multi-metal contaminated mine tailings. Plant length and fresh weight in the MA2/MB2-applied treatments were significantly higher than those in the non-amended treatment, indicating MA2 and MB2 amendments could alleviate metal phytotoxicity. MA2 and MB2 application decreased metal uptake in plant leaves but increased metal uptake in plant roots, suggesting that MA2 and MB2 had significant enhancement on metal stabilization. Temporal variation of metal translocation in the soil-to-plant system showed that the function of MA2 and MB2 nearly reached a plateau in seven months. The removal rates of metals were higher after the application of MA2 than MB2, and by the following order: Cu (39.6%) > Zn (35.0%) > Cd (34.1%) > Hg (32.1%) > Pb (31.8%) > Mn (19.1%). The synergistic effect between S. nigrum L. and MA2/MB2 appeared to be particularly effective in terms of metal phytostabilization, and MA2 was superior to MB2.
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