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Pb, ash analysis of heavy metals

 value                  literature
----------------------------------
   18.00 ppm                 1
   29.00 ppm                 1
   40.00 ppm                 1
----------------------------------
count                        3
average                  29.00 ppm
standard deviation        8.98 ppm(31 %)

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