Table (21).

XRF for elemental concentrations (soil).

Name	Z (Atomic number)	Value
Na	11	0.677
Mg	12	2.279
Al	13	1.780
Si	14	6.081
P	15	0.162
S	16	5.712
Cl	17	0.432
K	19	0.439
Ca	20	30.015
Ti	22	0.200
V	23	0.026
Cr	24	0.138
Mn	25	0.105
Fe	26	15.507
Ni	28	0.085
Cu	29	0.952
Zn	30	0.725
As	33	0.011
Sr	38	0.499
Mo	42	0.012
Ba	56	0.070