Fig. 3. Comparison of phenanthrene K_oc values with the degree of humic acid (HA) condensation (H to C ratio). (A) Linear and (B) exponential correlations are tested for relationships between K_oc values and H to C ratios. CHA, compost humic acid; PHA, peat humic acid; SHA, soil humic acid; U, untreated; H, hydrolysis; O, oximated; B, bleached; and S, subcritical water extracted.

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