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

Figure 4. Sorption isotherms of NO3 −-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 NO3 −-N sorbed by per unit mass of biochar at equilibrium; Ce: concentration of NO3 −-N in the solution at equilibrium).

Figure 4

Bars indicate standard deviation of three replicates.