Thiosulfate drives vanadium natural attenuation in oligotrophic mine tailings: Insights from DNA-SIP and metagenomics.
Zhang M, Sun H, Ren Y, Chen K, Yan G
Phytoremediation
Old mine tailings can leach toxic metals into surrounding soils for generations, keeping those landscapes barren — understanding what finally lets microbes neutralize that contamination is what eventually gives native plants a foothold to reclaim the ground.
Mining operations leave behind ponds full of toxic metals, including vanadium. Scientists discovered that naturally occurring bacteria in these ponds use a sulfur compound to chemically transform vanadium into a locked, harmless form that stays put in the sediment. By tracking which bacteria were actively doing this work, researchers got a clearer picture of how contaminated land can slowly heal itself.
Key Findings
Thiosulfate acts as the critical electron donor that fuels microbial vanadium(V) reduction in otherwise nutrient-poor mine tailings, driving natural contaminant immobilization.
DNA stable-isotope probing (DNA-SIP) combined with metagenomics identified the specific microbial taxa actively performing vanadium reduction, resolving which organisms drive attenuation in oligotrophic conditions.
Microbial reduction converts soluble, toxic vanadium(V) to insoluble vanadium(IV), effectively immobilizing the metal in sediment and cutting off its pathway into surrounding ecosystems.
chevron_right Technical Summary
Bacteria living in the nutrient-starved waste ponds left by mining use a sulfur compound called thiosulfate to neutralize toxic vanadium, converting it from a mobile, harmful form into one that stays locked in sediment. This natural microbial process could reduce the spread of vanadium contamination from mine sites without requiring costly engineered cleanup.
Abstract Preview
Vanadium (V) accumulation in mine tailing ponds represents a persistent contamination source, posing severe risks to the surrounding ecosystems. Microbial V(V) reduction represents a key pathway of...
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