What permanence means in chemistry, how it's measured, and what verification actually requires — not what it promises.
When biological material decomposes — whether through burning, rotting, or microbial activity — the carbon bound up in it returns to the atmosphere as CO₂. This is normal. Plant tissue is biologically designed to degrade. The carbon cycle depends on it.
Biochar is different because its carbon has been structurally transformed. The conversion process rearranges carbon atoms from the disordered, oxygen-rich structures of plant biomass into a turbostratic, graphite-like arrangement — stacked aromatic carbon sheets that are chemically resistant to oxidation and microbial breakdown.
This is not a permanence claim based on models or projections. It is a material property, measurable in the lab. The ratio of hydrogen to organic carbon (H/Corg) serves as a proxy for the degree of aromaticity and therefore the degree of stability. The European Biochar Certificate sets the permanence threshold at H/Corg < 0.7 (feedstock-dependent). For Class 1 biochar — our standard production grade — the threshold is H/Corg < 0.4.
Below this ratio, pyrolytic carbon resists biological and chemical degradation across multi-centennial timescales. Our standard biochar targets H/Corg ≤ 0.35, confirmed by accredited laboratory analysis on every batch using methods compliant with EBC 2023 and IBI-STD-2.0.
At H/Corg below 0.4, the mean residence time of biochar carbon in soil has been measured across independent studies at anywhere from 500 to over 3,000 years. The upper bound is genuinely uncertain; the lower bound is not. Any biochar meeting this threshold represents durable carbon removal on a timescale relevant to climate intervention.
Activated carbon and carbon fuel operate differently. Their carbon is not sequestered — it is used, consumed, or eventually released. The permanence story belongs specifically to the biochar product line. Activated carbon and carbon fuel displace inputs with higher lifecycle emissions; they are substitution plays, not sequestration plays.
The biochar industry contains a wide quality range. Slow-pyrolysis biochar made at high temperature from dry feedstock can have H/Corg below 0.3. Poorly made biochar from wet feedstock at low temperature can sit at 0.6 or higher, with mean residence times closer to decades than centuries. The spec sheet matters. "Biochar" without a grade or H/Corg value is not a carbon removal claim; it is a material claim with unspecified durability. EBC certification requires laboratory-confirmed H/Corg on every production batch before certification is issued.
A biochar credit has two components: the carbon removed (the H/Corg-determined fraction of feedstock carbon fixed into stable form) and the additionality (whether that removal would have happened without the economic mechanism). Our soil application pathway delivers on both: feedstock that would otherwise decompose or combust, converted to biochar with demonstrable permanence, applied to fields with documented GPS coordinates and application rates. Third-party auditors verify each step. Batch-level certificates are issued per EBC protocol and available to off-take counterparties on request.
Biochar's agronomic and climate benefits are both application-rate dependent. At 1 t/ha, the effect on CEC and water retention is measurable but modest. At 5 t/ha on degraded soil, the change in soil physical properties is significant enough to affect yield in the first season. Too high a rate on already-good soil can suppress microbial activity; too low a rate on heavily degraded soil misses the remediation opportunity. We work with application partners who match rate to soil type and crop system — the product specification is only part of the carbon story.
The primary certification framework we use for biochar quality and carbon permanence. EBC sets standards for H/Corg ratio, heavy metal limits, pH range, and ash content. EBC-Agro is the grade applicable to soil amendment use. Third-party auditors certify annually; batch-level lab reports are required for each production run.
The IBI standard provides an alternative certification pathway and is widely referenced in North American and Asian markets. IBI Class 1 biochar requires fixed carbon ≥ 60% (we target ≥ 70%) and H/Corg < 0.7 at Class 1 level. Our product quality exceeds IBI Class 1 thresholds across all key parameters.
Carbon removal claims require documented MRV at three levels: feedstock intake (mass and moisture), production batch (conversion parameters and output yield), and application (location, rate, and timing). We maintain batch-level records across all three stages. CDR buyer documentation packages are available and include production logs, lab certificates, and application records.
Carbon accounting in physical biochar works from a mass balance, not from an emissions factor applied to a projection. The chain of custody is auditable at every stage.
Every feedstock delivery is weighed, moisture-tested, and assigned a batch number. Origin is recorded. The dry mass of organic carbon in the incoming material is calculated as the basis for the eventual carbon balance. This step determines the denominator in the carbon conversion efficiency calculation.
Each production run generates output data: yield by weight, conversion temperature profile, and residence time. The yield fraction (biochar output as a percentage of dry feedstock input) is a quality indicator — too high suggests incomplete conversion; too low may indicate feedstock variability. Both are flagged.
Samples from every production batch are sent to an accredited third-party laboratory before the batch is released for sale or application. Tests include: H/Corg ratio (EBC protocol), fixed carbon and ash (proximate analysis, ASTM D3172), pH, heavy metal screening (EBC 2023 limits), and bulk density. Results must meet grade specification before release.
For soil application and CDR credit generation, application is documented with GPS coordinates, field area, application rate (t/ha), date, and farmer/operator identification. This record set is the final link in the chain from feedstock to sequestered carbon and forms the basis for credit issuance under both EBC and voluntary carbon market methodologies.
Annual EBC certification audits are conducted by an accredited third-party certification body. Auditors review production records, laboratory reports, and application documentation. Certification is issued per producer, per facility, and per product grade. Batch-level certificates reference the audit and can be provided to buyers alongside product delivery.