Type of snails | Name of the sample of snails shells | Chemical composition (%) | Specific surface (m2∙g−1) | Point of zero charge (PZC) | |||
Aragonite (CaCO3) | Calcite (CaCO3) | Quartz (SiO2) | Organic matter | ||||
Achatina achatina | EG | 97.21 | 1.18 | - | 2.1 | 1.053 | 9.1 |
EGC | - | 100 | - | - | 0.871 | 9.4 | |
Lanistes varicus | EA | 97.21 | 1.18 | 0.2 | 2.09 | 1.390 | 8.9 |
EAC | - | 100 | - | - | 0.449 | 9.5 |