Fig. 6

Deconvolution of the spectra glyphosate absorbed onto ferrihydrite at pH 5.0 and in presence of NaCl (a) 0.1 mol L⁻¹ and (b) 0.01 mol L⁻¹. The deconvolution of the bands of glyphosate adsorbed onto ferrihydrite were done in the range from 1189 to 1449 cm⁻¹ for (a) and in the range from 1187 to 1458 cm⁻¹ for (b). The best fittings were obtained with 6 bands (r² = 0.999) for (a) and 6 bands (r² = 0.998) for (b), in the Origin Program 8.0