Journal
CHEMISTRY AND ECOLOGY
Volume 29, Issue 8, Pages 709-723Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02757540.2013.817568
Keywords
bauxite residue; ecotoxicology test; element fractions; heavy metals; leaching
Funding
- National Innovation Office (SOILUTIL) [TECH-09-A4-2009-0129]
- TAMOP [4.2.4.A-1]
- Hungarian State
- European Union
- European Social Fund
- Hungarian Academy of Sciences
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A soil column experiment was set up to investigate the effect of red mud from Ajka (Hungary) on a typical soil profile from the affected area. The chemical changes caused by the red mud leachate and the effects of these changes on living organisms were assessed. Ecotoxicological tests were performed with Vibrio fischeri, Sinapis alba and Folsomia candida and the number of aerobic heterotrophic microorganisms was determined. The total, plant-available, exchangeable and water-soluble fractions of Na, Mo, Cu and Cr increased in the soil, mostly owing to their leaching from the red mud layer, but partly to the increase in the pH and DOC concentration. The chemical changes only had significant effects on the test organisms in the 0-30 cm soil layer, except for F. candida, which also had a lower survival rate in the 30-50 cm soil layer. No severe toxic effects were detected in the test organisms; in fact a stimulating effect was revealed for the aerobic heterotrophic cell number and for S. alba germination. However, the red mud itself was toxic, so the ecotoxicological tests justified the removal of red mud from the soil surface after the disaster.
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