Fig. 5 Correlations between the free radical concentration and (a) H concentration, (b) C:H ratio, and (c) light absorption at 465 nm (E₄₆₅) for all mobile humic acid (MHA) and calcium humate (CaHA) samples. Data for light absorption are from Olk et al. (1996, 1998)(and unpublished). Units are optical density units (g HA–C L^-1)^-1

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