Abstract

A new method to determine oxygen in the 0.01 to 1% range is described. The sample is volatilized and reacted with platinized carbon to convert the oxygen to carbon monoxide which is measured by an infrared detector. By use of hydrogen as a carrier gas, the high inconsistent blank is minimized since the hydrogen reduces any metal oxide impurity in the pyrolysis filling. The plugging problem of the carbon filling is overcome by using a vertically placed combustion tube that contains a combination of graphite chips and platinized carbon powder. The method can be used to determine trace oxygen in liquid samples such as naphthas and gas oils and in solid samples such as polymers and petroleum resids. The relative standard deviation for samples containing less than 0.5% oxygen is about 5%. 6 references, 3 figures, 5 tables.

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