Preamplifiers active components

The hydrogen composition of subsurface gases has been measured in geochemical studies. The H2 gas component in the gas mixture must be separated chromatographically and detected using high sensitivity instruments. The concentration of H2, He, Ne, Ar, N2, and CH4 in gas samples can be directly determined under optimum conditions use of an 8 m column packed with a 60-80 mesh 5 A molecular sieve activated at 360 °C for 12 h, and the use of oxygen gas as the carrier gas. The determination limit for H2 is 10 mL with a preamplifier. 

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