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Biochar-nanoparticle combinations enhance the biogeochemical recovery of a post-mining soil
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Orientador(es)
Resumo(s)
Here we addressed the capacity of distinct amendments to reduce arsenic (As), copper (Cu), selenium (Se) and
zinc (Zn) associated risks and improve the biogeochemical functions of post-mining soil. To this, we examined
nanoparticles (NPs) and/or biochar effects, combined with phytostabilization using Lolium perenne L. Soil sam-
ples were taken in a former metal mine surroundings. Ryegrass seeds were sown in pots containing different
combinations of NPs (zero-valent iron (nZVI) or hydroxyapatite (nH)) (0 and 2 %), and biochar (0, 3 and 5 %).
Plants were grown for 45 days and the plant yield and element accumulation were evaluated, also soil properties
(element distribution within the soil fractions, fertility, and enzymatic activities associated with microbiota
functionality and nutrient cycling) were determined. Results showed biochar-treated soil had a higher pH, and
much higher organic carbon (C) content than control soil and NP-treated soils, and it revealed increased labile C, otal N, and available P concentrations. Soil treatment with NP-biochar combinations increased exchangeable
non-acid cation concentrations and reduced exchangeable Na%, improved soil fertility, reduced sodicity risk, and
increased ryegrass biomass. Enzymatic activities, particularly dehydrogenase and glucosidase, increased upon
the addition of biochar, and this effect was fostered by NPs. Most treatments led to a significant reduction of
metal(loid)s contents in biomass, mitigating contamination risks. The two different NPs had similar effects in
many parameters, nH outperformed nZVI in terms of increased nutrients, C content, and enzymatic activities. On
the basis of our results, combined biochar-NP amendments use, specially nH, emerges as a potential post-mining
soil restoration strategy.
Descrição
Palavras-chave
Soil restoration Nanoremediation Mining Heavy metal(loid)s Soil biology
Contexto Educativo
Citação
Forján, Rubén, et al. «Biochar-Nanoparticle Combinations Enhance the Biogeochemical Recovery of a Post-Mining Soil». Science of The Total Environment, vol. 930, junho de 2024, p. 172451. https://doi.org/10.1016/j.scitotenv.2024.172451.
Editora
Elsevier