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value literature
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3.80 ppm 1
4.24 ppm 1
4.26 ppm 1
4.50 ppm 1
4.70 ppm 1
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count 5
average 4.30 ppm
standard deviation 0.30 ppm(7 %)

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