Amendment Application in a Multicontaminated Mine Soil: Effects on Trace Element Mobility

摘要

Several amendments were tested for their effectiveness in aiding plant growth and immobilising contaminants in pots containing soil from an arsenopyrite mine contaminated with arsenic and heavy metals and planted with two native grass species, Arrhenatherum elatius subsp. Bulbosum and Festuca curvifolia. Trace element solubility in pore water was monitored using Rhizon samplers for 5 weeks. Results showed that amendments containing ferrous sulphate and ferrous sulphate combined with recycled de-inking paper sludge limited arsenic mobilisation and increased metal solubility. However, ferrous sulphate in combination with calcium carbonate was effective in reducing arsenic and metal solubilisation. Plant biomass of A. elatius was a sensitive indicator of the comparative efficiency of the amendments, although metal(loid) concentration in pore water did not correlate with plant uptake.