Fig. 1. Fate of ¹⁴C during the course of the experiment. Results for extractable ¹⁴C are shown in (a) with curves representing nonlinear regression fits of the first-order equation. Symbols for (a) are • VBS extractable and BF extractable. The nonextractable and mineralized components are illustrated in (b). Symbols for (b) are VBS Mineralized, BF Mineralized, • VBS nonextractable, and BF nonextractable.