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value literature
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1.50 ppm 1
1.80 ppm 1
2.20 ppm 1
2.40 ppm 1
2.40 ppm 1
2.50 ppm 1
2.70 ppm 1
2.70 ppm 1
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count 8
average 2.28 ppm
standard deviation 0.40 ppm(18 %)

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