Table 1 Major and trace element contents of the shales (after Soliman et al.52).

From: Advanced electrical diagnostics for monitoring soil contamination: a laboratory-based assessment approach

Element

Value (%)

Element

Value (ppm)

Sio2

46.09

Sr

254

Al2O3

15.08

Ba

208.8

CaO

5.3

V

122.4

MgO

1.73

Ni

79.5

Fe2O3

7.32

Cr

109.7

TiO2

0.95

Zn

118.3

P2O5

0.25

Cu

19.5

K2O

1.34

Zr

421.9

Na2O

1.97

Rb

51.9

SO3

0.14