Figure 1.

Time-dependent loss of precursors in a water-sediment slurry incubated at 29 °C. Means (circles = bioactive; squares = controls) and standard deviation (error bars) of measurements (n = 3 per timepoint) are shown as values normalized to the input concentration. Data were modeled using eq 2. Solid lines show modeled values (expected mean), and shaded regions represent the 90th % CI. Rates (days^–1, expected mean and 90th % CI) are shown in text on each panel. The structure of each precursor is shown above the panels including species likely to be abundant in the range of experimental pH according to their pK_a values computed using a physicochemical calculator (SPARC).⁴⁵