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Literature compilation of REE constants with (a) low molecular weight organic acids (Byrne and Li, 1995), (b) biochars from this study (c) Bacillus subtilis bacteria (Martinez et al., 2014), (d) Aldrich humic acid (AHA), (e) Suwannee River fulvic acid (SRFA) and Leonardite humic acid (LHA) (Sonke and Salters, 2006).
