Element FA1 FA2 FA3
C 8.69 25.35 13.54
O 30.80 33.15 23.90
Na 2.26 1.29 1.75
Mg 2.61 1.23 3.01
Al 3.59 8.83 4.28
Si 7.50 13.87 6.17
P 1.12 0.73 0.63
S 3.58 0.99 1.51
Cl 11.96 1.26 17.23
K 2.79 1.44 1.50
Ca 22.95 7.89 21.66
Fe 2.15 3.24 0.56
LOI 7.17 10.3 18.2
  heavy metals concentration (mg/kg)  
Pb 2943.5 (713.7)* 1964.2 (70.1) 1237.4 (214.1)
Cd 142.2 (15.0) 68.4 (14.8) 74.7 (13.3)
Cr 74.3 (21.4) 93.7 (7.7) 117.3 (34.3)
Zn 9743.8 (1511.4) 7512.5 (221.6) 8053.4 (780.2)
Cu 465.2 (43.2) 542.7 (75.9) 227.7 (21.1)
Ni 74.9 (34.9) 69.2 (33.7) 55.9 (31.2)
LOI - loss of ignition
*Values in parentheses are standard deviation of means of triplicate
Table 1: Elemental composition of fly ashes (wt%).