Table 4 shows the Hg concentrations of solid and liquid samples
collected in the field. The Hg concentration in bottom
ash ranged from 1 to 16 μg/kg. The concentration of Hg in fly
ash from the ESP hopper varied from 10 to 295 μg/kg. The
Hg content of gypsum (by-product from wet FGD) ranged
from 38 to 561 μg/kg. In addition, the Hg in fine ash from
FF was 2945 μg/kg. All of the collected data have been used
for the calculation of mercury mass balance in the coal-fired
power plants