Does the walkley‐black method determine soil charcoal?

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Abstract
The Walkley‐Black Method is shown to recover charcoal carbon (C) from both charcoal samples made in the laboratory from a range of plant materials as well as from soils containing various amounts of relic charcoal. The rate of recovery of charcoal C depends on the nature of the material from which it is derived and its particle size but not on its surface area. From the data presented, it is clear that the Walkley‐Black Method recovers charcoal C with a high enough efficiency so that, at the concentrations of charcoal found in soil, given its fine particle size and the potentially diverse nature of its origin, it is not possible to differentiate between charcoal C and other organic forms found in soil by this method.

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