Table 4:
Concentrations of chemical elements in ROFA.
Elements
Averages ± SD (ppm)
Copper
5.64 ± 1.09
Cadmium
0.01 ± 0.00
Chrome
4.20 ± 0.71
Nickel
467.19 ± 9.75
Magnesium
32.42 ± 4.60
Iron
12265.77 ± 2697.33
Lead
0.58 ± 0.18
Zinc
21.12 ± 1.34