Fig. 1. Distribution of the metal concentration (mg kg^–1 total solids [TS]) in granules from the paper mill sludge (A and C) and the distillery sludge (B and D). From left to right, bars represent the following fractions: exchangeable, carbonates, organic matter, and residual. (A) and (B), micronutrients; (C) and (D), macronutrients.