Estimation of charcoal (char) in soils

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Abstract
A method for the semiquantitative estimation of charcoal (char) in soils is reported. The technique, performed on the <53 μm fraction of soils, utilizes the highly aromatic nature of char and its relative stability to two hours of high energy ultraviolet photo‐oxidation compared to other soil carbon fractions. The proportion of char in the 90% of soil char in the <53 μm fraction. Because of the assumptions used, estimates of char by this approach must be considered to be semiquantitative, but are conservative and provide estimates of the minimum char content of a soil.