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sunflower /straw

Pb, ash analysis of heavy metals

 value                  literature
----------------------------------
    1.00 ppm                 1
    1.00 ppm                 1
    5.00 ppm                 1
    6.00 ppm                 1
----------------------------------
count                        4
average                   3.25 ppm
standard deviation        2.28 ppm(70 %)

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