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Cd, ash analysis of heavy metals

 value                  literature
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    2.20 ppm                10
    2.50 ppm                10
    6.00 ppm                10
    6.30 ppm                10
    7.90 ppm                10
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count                        5
average                   4.98 ppm
standard deviation        2.24 ppm(45 %)

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