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