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Biochar application to a contaminated soil reduces the availability and plant uptake of zinc, lead and cadmium
Abstract
Heavy metals in soil are naturally occurring but may be enhanced by anthropogenic activities such as mining. Bio-accumulation of heavy metals in the food chain, following their uptake to plants can increase the ecotoxicological risks associated with remediation of contaminated soils using plants. In the current experiment sugar cane straw-derived biochar (BC), produced at 700 °C, was applied to a heavy metal contaminated mine soil at 1.5%, 3.0% and 5.0% (w/w). Jack bean (Canavalia ensiformis) and Mucuna aterrima were grown in pots containing soil and biochar mixtures, and control pots without biochar. Pore water was sampled from each pot to confirm the effects of biochar on metal solubility, whilst soils were analyzed by DTPA extraction to confirm available metal concentrations. Leaves were sampled for SEM analysis to detect possible morphological and anatomical changes. The application of BC decreased the available concentrations of Cd, Pb and Zn in 56, 50 and 54% respectively, in the mine contaminated soil leading to a consistent reduction in the concentration of Zn in the pore water (1st collect: 99 to 39 μg L(-1), 2nd: 97 to 57 μg L(-1) and 3rd: 71 to 12 μg L(-1)). The application of BC reduced the uptake of Cd, Pb and Zn by plants with the jack bean translocating high proportions of metals (especially Cd) to shoots. Metals were also taken up by Mucuna aterrima but translocation to shoot was more limited than for jack bean. There were no differences in the internal struct…
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“This finding is similar to reports of reduced heavy metal (e.g., Cd, Pb, and Zn) concentrations in pore water from biochar treated mine spoils (Beesley et al., 2014; Puga et al., 2015).”
From Remediation of an acidic mine spoil: Miscanthus biochar and lime amendment affects metal availability, plant growth, and soil enzyme activity (2018) · cites this paper as Puga et al., 2015
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Metadata
- Authors
- Puga, A. P., Abreu, C. A., Melo, L. C. A., & Beesley, L.
- Affiliations
- Agronomical Institute of Campinas (BR)
- Universidade Federal de Lavras (BR)
- James Hutton Institute (GB)
- Corresponding author
- Puga, A.P.
- Venue
- Journal of Environmental Management
- Publisher
- Elsevier BV
- Published
- 2015-08
- Volume
- 159
- Pages
- 86-93
- ISSN
- 0301-4797 (ISSN-L)
- OpenAlex
- W1849209822
- Cited by
- 408
- References
- 32
- Citations by year
- 2026: 21 · 2025: 29 · 2024: 43 · 2023: 36 · 2022: 49 · 2021: 50 · 2020: 49 · 2019: 43 · 2018: 27 · 2017: 30 · 2016: 26 · 2015: 5
- FWCI
- 18.14
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Environmental Management (publishedVersion)
- PubMed (publishedVersion)
- Funders
- São Paulo Research Foundation – FAPESP (2014/04454-9, 2012/01799-0)
- Topics
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Environmental Science › Water Science and Technology › Environmental and Analytical Chemistry Studies
- Keywords
- biochar, heavy metal contamination, mine soil remediation, zinc, lead, cadmium, metal bioavailability, plant uptake, sugarcane straw, Canavalia ensiformis, Mucuna aterrima, phytoremediation, metal translocation
- MeSH terms
- Brazil, Cadmium, Charcoal, Lead, Microscopy, Electron, Scanning, Mining, Phosphorus, Potassium, Soil, Soil Pollutants, Zinc, Plant Leaves, Mucuna, Canavalia
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