64
> 1050 ng /m 3
900 - 1050
750 -
900
600 -
750
450 -
600
300 -
450
500
550
DISTANCE (m)
R. Ferrara
PIANCASTAGNAIO
-50
-0
600
Fig. 7. Mercury levels (ng/n]") in a vertical section of the plume of a geothermal power plant,
measured by the LlDAR technique. Along the x axis is reported the height above the ground; along the
y axis the distance from the LlDAR system is reported
not being dependent on the ambient temperature. In Fig. 7 an example is
reported of the mercury distribution in the plume of a plant determined by the
LlDAR system. In the month of July 1995 the abandoned mine structures of the
smelting complex of Abbadia San Salvadore emitted an amount of mercury
14
12
10
.I: 8
"'E
"&
:::I. 6
4
2
0
f
f0
4
8
12
16
20
24
Hour
Fig. 8. Daily variation of the mercury degassing rate over a roasted cinnabar bank (July 1995)