The lack of correlations between whole soil KOC and NMR-derived
measures of C chemistry also provides evidence of the importance
of these interactions on whole soil KOC. However, it should also be
noted that HF-treatment did not reduce the variability in KOC
between the soils – in fact the coefficient of variation (standard
deviation divided by the mean) was almost the same for the HFtreated
soils (65%) as for the whole soils (63%) (Table 2).