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Sorption Interactions between Imazaquin and a Humic Acid Extracted from a Typical Brazilian Oxisol

Julieta A. Ferreiraa,b, Ladislau Martin-Neto*,a, Carlos M. P. Vaza and Jussara B. Regitanob

a Embrapa Instrumentação Agropecuária, C.P. 741, 13560-970 São Carlos (SP), Brazil
b Centro de Energia Nuclear na Agricultura, USP, Av. Centenário, 303, 13416-000 Piracicaba (SP), Brazil



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  		Fig. 1. Chemical structure and some physical–chemical properties of imazaquin (IM).

 


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

 


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  		Fig. 3. Effect of humic acid suspension pH on imazaquin (IM) (30 mg L-1) sorption determined by the differential pulse polarography method.

 


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  		Fig. 4. Effect of pH on the semiquinone free radicals content of humic acid (HA) (–{blacktriangledown}–) and imazaquin (IM)–HA (–{blacksquare}–) complexes (HA = 0.8 g L-1 and IM = 30 mg L-1). Standard error bars are presented.

 


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  		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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