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Table 1 Physical and chemical characteristics of scoria and pumice

From: Identification of two low-cost and locally available filter media (pumice and scoria) for removal of hazardous pollutants from tannery wastewater

Chemical composition Percent weight
Scoria Pumice
SiO2 52.46 64.92
Al2O3 18.14 10.82
Fe2O3 5.40 4.62
CaO 9.40 5.74
K2O 0.20 4.26
Na2O 3.28 4.92
MgO 7.44 0.92
MnO 0.12 0.20
P2O5 0.36 0.14
TiO2 0.41 0.15
H2O 1.12 0.85
LOI 2.08 3.67
pH 7.81 7.53
aPhysical properties, particle size = 0.075–0.425 mm
Porosity (%) 36 73
Particle density (gcm−3) 2.96 2.33
Specific surface area (BET) (m2 g−1) 2.49 3.5
Cation exchange capacity (CEC), mequiv. 100 g−1 0.09 0.84
  1. LOI loss on ignition
  2. aAlemayehu et al. (2011)