Fig. 5. Fourier-transform infrared (FTIR) spectra for the freeze-dried humic acid (HA) and HA–imazaquin (IM) complexes obtained from samples reacted at different pH values [(a) pH 5.0, (b) pH 3.0, and (c) pH 2.0] with HA = 1 g L^-1 and IM = 15 mg L^-1.

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