Review of the stability of biochar in soils: predictability of O:C molar ratios
Open accessAbstract
Biochar is not a structured homogeneous material; rather it possesses a range of chemical structures and a heterogeneous elemental composition. This variability is based on the conditions of pyrolysis and the biomass parent material, with biochar spanning the range of various forms of black carbon. Thereby, this variability induces a broad spectrum in the observed rates of reactivity and, correspondingly, the overall chemical and microbial stability. From evaluating the current biochar and black carbon degradation studies, there is the suggestion of an overall relationship in biochar stability as a function of the molar ratio of oxygen to carbon (O:C) in the resulting black carbon. In general, a molar ratio of O:C lower than 0.2 appears to provide, at minimum, a 1000-year biochar half-life. The O:C ratio is a function of production temperature, but also accounts for other impacts (e.g., parent material and post-production conditioning/oxidation) that are not captured solely with production temperature. Therefore, the O:C ratio could provide a more robust indicator of biochar stability than production parameters (e.g., pyrolysis temperature and biomass type) or volatile matter determinations.
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Converting waste biomass into biochar, bio-oil, and syn-gas intrinsically stores 2.20 × 10^9 t CO2e annually.
“Firstly, converting waste biomass into biochar, bio-oil, and syn-gas intrinsically stores 2.20 × 10 9 t CO2e annually, because it turns labile carbon that will be rapidly mineralized into recalcitrant carbon whose half life exceeds 1000 years (Ippolito et al. 2020; Lehmann et al. 2021; Spokas 2010).”
From Role of biochar toward carbon neutrality (2023) · cites this paper as Spokas 2010
The Abstract says pyrolysis produces bio-oil, a solid residue and gas, and that carbon sequestered as biochar can remain in a slower-cycling form for hundreds to thousands of years. It does not give the claimed 2.20 × 10^9 t CO2e annual figure or say that bio-oil and gas intrinsically store carbon. The Microbial degradation of biochar section reports widely varying estimated half-lives, so a half-life exceeding 1,000 years is not established for biochar generally. (LLM, conf=0.87)
Experimental — accuracy not yet measuredMiscanthus biochar had H/C (0.21) and O/C (0.03) molar ratios typical for grass feedstocks pyrolyzed at 500 to 700°C.
“The Miscanthus biochar had H/C (0.21) and O/C (0.03) molar ratios that are typical for grass feedstocks pyrolyzed at 500 to 700°C (Spokas, 2010).”
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 Spokas, 2010
The Oxygen to carbon molar ratio section says O:C varies with production temperature, but its correlation is weak; it does not establish ratios typical of grass biochars made at 500–700°C. Searches for Miscanthus, grass feedstocks, H/C 0.21, and O/C 0.03 found no passage verifying the specific comparison. Page numbers were unavailable in our copy. (LLM, conf=0.73)
Experimental — accuracy not yet measuredComplete graphitization requires a temperature greater than 1100°C during biochar preparation.
“To have a complete graphitization, a temperature greater than 1100°C should be reached during the biochar preparation (Spokas 2010).”
From Mechanisms and adsorption capacities of biochar for the removal of organic and inorganic pollutants from industrial wastewater (2021) · cites this paper as Spokas 2010
The Chemical composition variability section discusses graphitization but gives no 1100°C threshold; it says graphitization at the temperatures and pressures under discussion would require more than 10,000 years. A search for 1100°C and graphitization found no passage stating the claimed temperature requirement for biochar preparation. (LLM, conf=0.72)
Experimental — accuracy not yet measuredThe electron donor and acceptor interaction mechanism is mostly applied to adsorption of aromatic compounds on biochar with a graphene-like structure.
“The electron donor and acceptor interaction mechanism is mostly applied to the adsorption of aromatic compounds on biochar presenting a graphene-like structure.”
From Mechanisms and adsorption capacities of biochar for the removal of organic and inorganic pollutants from industrial wastewater (2021) · cites this paper as Spokas 2010
Chemical composition variability (page unavailable) describes graphitic sheets in biochar, and Box 1 (page unavailable) reports aromatic compounds sorbed on biochar. Neither passage addresses electron donor–acceptor interactions or says that this mechanism is mostly applied to adsorption on graphene-like biochar. Searches for the mechanism and its proposed application found no supporting passage. (LLM, conf=0.75)
Experimental — accuracy not yet measured
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Flagged first, then by citations
Research works printed but not linked: 5
- n Review article on the surface chemistries of black carbon (biochar).
- n Review of biochar, covering many of the other factors and considerations for biochar use and benefit.
- Ozcimen D, Karaosmanoglu F. Production and characterization of bio-oil and biochar from rapeseed cake. Renew. Energ. 29(5), 779-787 (2004).
- Review Spokas
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“To have a complete graphitization, a temperature greater than 1100 °C should be reached during the biochar preparation (Spokas 2010).”
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Biochar Role in the Sustainability of Agriculture and Environment
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- Authors
- Spokas, K. A.
- Affiliations
- Agricultural Research Service (US)
- Corresponding author
- Spokas, Kurt A
- ORCID
- Spokas, Kurt A
- Venue
- Carbon Management
- Publisher
- Informa UK Limited
- Published
- 2010-12
- Volume
- 1
- Issue
- 2
- Pages
- 289-303
- ISSN
- 1758-3004 (ISSN-L)
- 1758-3012
- OpenAlex
- W2102398472
- Cited by
- 1,160
- References
- 137
- Citations by year
- 2026: 52 · 2025: 99 · 2024: 113 · 2023: 121 · 2022: 107 · 2021: 119 · 2020: 87 · 2019: 86 · 2018: 76 · 2017: 63 · 2016: 57 · 2015: 68 · 2014: 45 · 2013: 33 · 2012: 24
- FWCI
- 35.44
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Carbon Management (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Soil Science › Soil Carbon and Nitrogen Dynamics
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Environmental Science › Global and Planetary Change › Fire effects on ecosystems
- Keywords
- biochar stability, soil carbon, black carbon, pyrolysis temperature, microbial degradation
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