title: Evaluation of ferrihydrite as amendment to restore an arsenic-polluted mine soil.
abstract: The effectiveness of ferrihydrite as amendment to restore the soil habitat functioning of a soil polluted with As by mining activities was evaluated. Its influence on As mobility and phytoavailability was also assessed. Soil treated with increasing amendment doses (0, 1, 2, and 5 %) were analyzed for soil microbiological parameters such as basal soil respiration and dehydrogenase, β-glucosidase, urease, acid and alkaline phosphatase, and arylsulfatase activities. Batch leaching tests and plant growth experiments using ryegrass and alfalfa plants were performed. The treatment with ferrihydrite was effective to reduce As mobility and plant As uptake, translocation, and accumulation. Likewise, the soil microbiological status was generally improved as derived from basal soil respiration and dehydrogenase and acid and alkaline phosphatase activities, which showed increases up to 85, 45, 11, and 47 %, respectively, at a ferrihydrite addition rate of 5 %.
authors.affiliation: Department of Environmental Geochemistry, IRNASA (CSIC), C/ Cordel de Merinas 40-52, 37008, Salamanca, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Abad-Valle
authors.forename: E
authors.initials: E
authors.lastname: Álvarez-Ayuso
authors.forename: A
authors.initials: A
authors.lastname: Murciego
mesh_terms: D000469:Alkaline Phosphatase / Q000737:chemistry; D001151:Arsenic / Q000032:analysis / Q000378:metabolism*; D001426:Bacterial Proteins / Q000737:chemistry; D001673:Biodegradation, Environmental; D005290:Ferric Compounds / Q000494:pharmacology*; D008129:Lolium / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D000455:Medicago sativa / Q000187:drug effects / Q000378:metabolism*; D008906:Mining; D010088:Oxidoreductases / Q000737:chemistry; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000378:metabolism*; D014018:Tissue Distribution
chemical_list: D001426:Bacterial Proteins; D005290:Ferric Compounds; D012989:Soil Pollutants; C092844:ferric oxyhydroxide; D010088:Oxidoreductases; D000469:Alkaline Phosphatase; D001151:Arsenic