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Pb, ash analysis of heavy metals

 value                  literature
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   44.20 ppm                10
   51.10 ppm                10
   53.10 ppm                10
   67.10 ppm                10
   72.20 ppm                10
----------------------------------
count                        5
average                  57.54 ppm
standard deviation       10.44 ppm(18 %)

UNIVERSITY OF TECHNOLOGY VIENNA
Institute of Chemical Engineering, Fuel and Environmental Technology
Getreidemarkt 9/159
A-1060 Vienna
Austria