Research Article
Adsorption of Heavy Metals on Bentonitic Soil for Use in Landfill Liners
Table 3
Methods for characterization of the investigated soil.
| Characteristic | Method |
| Grain size distribution | ASTM D7928 and ASTM D6913 | Specific gravity of solids, Gs | ASTM D854 | Liquid limit, wL | ASTM D4318 | Plastic limit, wP | ASTM D4318 | USCS classification | ASTM D2487 | Optimum water content, wopt (proctor standard energy) | ASTM D698 | Maximum dry unit weight (proctor standard energy) | ASTM D698 | Mineralogical composition | X-ray diffraction | Hydraulic conductivity at optimum water content | ASTM D5856 | Chemical composition | X-ray fluorescence | Cation exchange capacity | ASTM D7503 | Organic content | ASTM D2974 | Electric conductivity | Embrapa [52] | pH in water and in KCl | Embrapa [52] |
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Unified Soil Classification System. |