Fig. 2. Sorption isotherms for humic acid (HA)–imazaquin (IM) and soil–IM complexes obtained from samples reacted at pH 2.0 (––), pH 4.0 (–•–), and pH 6.0 (––) (HA = 0.02 g L^-1; soil = 2 g L^-1).

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