A FIELD METHOD FOR THE MEASUREMENT OF HELIUM IN NATURAL GASES

摘要

A simple gas chromatograph for the measurement of helium in natural gases is described. A 6 metre charcoal column is used to separate the gases in the sample, and carbon dioxide is used as the carrier gas, since it is then possible to use a simple detector consisting of a nitrometer filled with 50% potassium hydroxide solution. 0.1% of helium in mixtures of hydrogen, air, methane, carbon monoxide and carbon dioxide can be detected, provided that the hydrogen is first removed with palladium sponge. The limit of detection depends directly upon the purity of the carbon dioxide, and the design of a high pressure fractionating still is given in addition to the design of a portable chromatograph.