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REE patterns of modelled log Kd (REE-humic acid) at (a) pH 5 and IS 10−3 mol/L and (b) pH pH 7 and IS 10−3 mol/L, (c) pH 5 and IS 10−2 mol/L, (d) pH 7 and IS 10−2 mol/L, (e) pH 5 and IS 10−1 mol/L and (f) pH 7 and IS 10−1 mol/L, illustrating evolution of REE fractionation. Modelling was performed using PHREEQC-Model VI considering experimental condition and HA acting as biochar.
