JEQ -- Hiradate et al. 36 (1): 101 Figure IG7

Click on image to view larger version.

Fig. 7. Comparison of 2,4-D adsorption ability among metal-humate complexes. (A) humic acid (HA) was complexed in the presence of 0.01 M CaCl₂ (•), 0.1 M CaCl₂ ( ${circ}$ ), 0.01 M FeCl₃ ( ${blacktriangleup}$ ), and 0.01 M AlCl₃ ( ${blacksquare}$ ). (B) Comparison between Al-humate complex (humic acid was complexed in the presence of 0.01 M AlCl₃, ${blacksquare}$ ) and Al hydroxides (0.01 M AlCl₃ was precipitated by adding NaOH in the absence of HA, ${square}$ ). Reaction time, 4 h; initial 2,4-D concentration, 22.6 µM (5.0 mg L^–1); humic acid added, 2.0 mg; COOH added, 8.14 µmol; Al or Fe added, 50 µmol; Ca added, 50 or 500 µmol.