Research Article
Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners
Table 6
Statistical analysis of sorption isotherms.
| Metal | Model | Coefficients | Estimated value | p-level | |
| Pb | Linear | Kd(L/g) | 0.68 | 0.019 | 0.815 | Freundlich | Kf (L/g) | 2.83 | 0.019 | 0.877 | n | 2.79 | 0.005 | Langmuir | KL (L/mg) | 1.73 | 0.034 | 0.946 | b (mg/g) | 6.70 | 0.001 |
| Cu | Linear | Kd(L/g) | 0.028 | 0.005 | 0.815 | Freundlich | Kf (L/g) | 0.48 | 0.284 | 0.986 | n | 2.83 | 0.150 | Langmuir | KL (L/mg) | 0.13 | 0.523 | 0.931 | b (mg/g) | 2.40 | 0.071 |
| Cd | Linear | Kd(L/g) | 0.02 | 0.010 | 0.765 | Freundlich | Kf (L/g) | 0.46 | 0.005 | 0.969 | n | 2.79 | 0.002 | Langmuir | KL (L/mg) | 0.05 | 0.188 | 0.987 | b (mg/g) | 3.05 | 0.006 |
| Ni | Linear | Kd(L/g) | 0.04 | 0.020 | 0.964 | Freundlich | Kf (L/g) | 0.25 | 0.014 | 0.987 | n | 2.38 | 0.028 | Langmuir | KL (L/mg) | 0.36 | 0.061 | 0.951 | b (mg/g) | 0.87 | 0.003 |
| Zn | Linear | Kd(L/g) | 0.03 | 0.005 | 0.957 | Freundlich | Kf (L/g) | 0.22 | 0.000 | 0.999 | n | 2.38 | 0.000 | Langmuir | KL (L/mg) | 0.06 | 0.136 | 0.975 | b (mg/g) | 1.57 | 0.010 |
| Cr | Linear | Kd(L/g) | 0.05 | 0.002 | 0.962 | Freundlich | Kf (L/g) | 0.22 | 0.006 | 0.781 | n | 2.00 | 0.001 | Langmuir | KL (L/mg) | 0.23 | 0.188 | 0.737 | b (mg/g) | 1.22 | 0.029 |
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