soil C content by dividing by the organic C fraction (fOC) to give KOC.
However, the relationship between Kd and fOC is not an exact one,
and hence KOC for a given molecule can vary considerably between
soils. In a review of published KOC measurements, Wauchope et al.
(2002) reported that where KOC had been determined for a large
number of soils, the coefficient of variation in KOC was generally
around 40–60% and that the ratio of maximum to minimum KOC
was generally around 3–10. They suggested variations in the nat-
ure of organic matter between soils may be a major contributor
to this variation.