Fig. 7 shows solid concentrations of trace elements, of which only Rb, Nb and W were found at concentrations greater than 0.1 ppm. W showed the greatest change, with concentration increasing from 0.06 to 0.42 to 0.74 ppm for inventories 4.5, 6 and 13 kg respectively. All trace element flue gas concentrations were found at a concentration of <0.1 ppm and therefore considered negligible.
Rb, Nb and W
concentrations
greater than 0.1 ppm
ppm
W
concentration
0.06
ppm
W
concentration
0.42
ppm
W
concentration
0.74 ppm
ppm
inventories
4.5, 6 and 13 kg
kg
trace element
flue gas concentrations
<0.1 ppm
ppm