Skip to main content

Table 2 Parameters of non-linear Langmuir, Freundlich and Langmuir–Freundlich for samples of glyphosate adsorbed onto ferrihydrite

From: The effect of pH and ionic strength on the adsorption of glyphosate onto ferrihydrite

[NaCl] mol L−1 Model K 1/n b R2
0.10 nl-Lang 0.023 54.88 0.903
nl-Freu 11.25 0.245 0.881
nl-Lang-Freu 0.015 0.657 64.83 0.928
0.01 nl-Lang 0.049 32.83 0.857
nl-Freu 11.75 0.160 0.780
nl-Lang-Freu 0.046 0.785 34.40 0.864
  1. Each result was mean of four experiments. The solutions were stirred for 24 h at room temperature, at pH 5.0 with 60 mg of ferrihydrite. nl-Lang: non-linear Langmuir; nl-Freu: non-linear Freundlich; nl-Lang-Freu: non-linear Langmuir–Freundlich single site. K (Langmuir) (L mg−1) and K (Freundlich) (mg g−1) (L g−1): adsorbate–adsorbent affinities; b: maximum adsorption capacity (mg g−1); 1/n: empiric Freundlich constant