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Cr, ash analysis of heavy metals

 value                  literature
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   12.50 ppm                10
   13.50 ppm                10
   16.70 ppm                10
   18.00 ppm                10
   21.10 ppm                10
----------------------------------
count                        5
average                  16.36 ppm
standard deviation        3.11 ppm(19 %)

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