Abstract
Amendments are good tools for immobilizing metal(loid) and improving phytoremediation success. However, the amendment effect is variable and depends on multiple parameters, including amendment type and ageing. Such an ageing effect is rarely studied. Our study is one of the first focusing on how biochar storage affects its effect on soil properties and metal(loid) immobilization, when biochar was applied alone or in combination with green manure. To answer this, a 33-day pot incubation experiment was set up using contaminated soil, amended with two biochars (differing in ages: old (Bo) and new (Bn)) and/or two green manures (leaves of clover or poplar) and sown with Phaseolus vulgaris (bioindicator plant). Soil pore waters, plant growth and metal(loid) accumulation were evaluated. Biochar reduced soil acidity (Bn: + 0.75 pH unit, Bo: + 0.72 unit) and Pb mobility (Bn: − 42%, Bo: − 50%), while green manures acidified the soil (− 0.30 pH unit) and immobilized Pb only after 10 days (− 44%). All amendments reduced soil phytotoxicity. Moreover, the biochar stored at room temperature for a few years demonstrated better abilities to improve soil properties, particularly for Pb immobilization, than the biochar freshly prepared. Finally, as mixtures maturated, soil parameters changed until about ten days, then tended to stabilize. Therefore, it can be concluded that (1) biochar storage will affect its chemical properties and ameliorate its effects, (2) biochar can ameliorate soil properties and immobilize metal(loid)s, while green manures tended to have adverse effects at first, and (3) soil/amendment mixtures should be left to mature about two weeks before potential plant implementation.
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The authors wish to thank Jean-Christophe Léger (La Carbonerie) for providing the biochars.
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ML contributed to data curation, software, writing—original draft; GP contributed to data curation, formal analysis, writing—original draft; SR contributed to formal analysis, writing—review and editing; YC contributed to formal analysis; BC was contributed to formal analysis; SB contributed to conceptualization, supervision, writing—review and editing; DM contributed to conceptualization, supervision, writing—review and editing.
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Lebrun, M., Palmeggiani, G., Renouard, S. et al. Natural ageing of biochar improves its benefits to soil Pb immobilization and reduction in soil phytotoxicity. Environ Geochem Health 45, 6109–6135 (2023). https://doi.org/10.1007/s10653-023-01617-5
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DOI: https://doi.org/10.1007/s10653-023-01617-5