Copper extraction and phytotoxicity of organic acid leached mine tailings in Brassica napus.
De Oliveira VH, Duddigan S, Symons J, Whelan MJ, Selvaraj V
Phytoremediation
PubMedCopper from old mine dumps can leach into the soil of nearby farms and gardens, and the 'natural' acids used to clean it up may leave behind invisible residues that poison the plants you try to grow there afterward.
Old copper mines leave behind huge piles of waste rock called tailings, which can poison nearby land and water. Scientists tested whether natural acids — the same kinds found in citrus fruit and apples — could pull the copper out and make the soil safer. They found that while the acids did remove a lot of copper, the soil left behind was still too toxic for canola plants to survive unless it was heavily diluted with water first.
Key Findings
Citric, malic, and malonic acids (at 1 M concentration) extracted the highest copper from mine tailings, producing leachate concentrations of 625–965 mg/L.
At 1/4 dilution, plants grown in acid-leached tailings showed severe stunting, chlorophyll loss, and reduced biomass compared to the water-only control.
Only at higher dilutions (1/16 or 1/128, simulating rainfall or natural biodegradation) did phytotoxicity decrease enough for Brassica napus to grow more normally.
chevron_right Technical Summary
Researchers tested five natural plant-derived acids to clean up copper-contaminated mine waste, finding that citric, malic, and malonic acids pulled the most copper out of the tailings — but left residues toxic enough to stunt or kill canola plants grown in the treated soil.
Abstract Preview
Mine tailings pose environmental hazards but can also contain economically valuable metals like copper (Cu). Organic solvents, particularly low molecular weight organic acids (LMWOAs), are natural ...
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