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. 2014 Dec 3;9(12):e113888. doi: 10.1371/journal.pone.0113888

Figure 2. Sorption isotherms of NH4 +-N on wheat-straw biochar (W-BC), corn-straw biochar (C-BC) and peanut-shell biochar (P-BC) at different pyrolytic temperatures (Qe: the amount of NH4 +-N sorbed by per unit mass of biochar at equilibrium; Ce: concentration of NH4 +-N in the solution at equilibrium).

Figure 2

Bars indicate standard deviation of three replicates.