Considerations on the use of hydrogen as carrier gas for gas chromatography
Fidelis, Carlos Henrique de V.
Palavras-chave: Gas chromatography, carrier gas, helium, hydrogen.
Resumo: The choice of carrier gas to be used in a gas chromatograph must consider operational reasons, as well as suitability for the intended application, which is a function of physical and chemical properties of gases. Both helium (He) and hydrogen (H2) meet the basic requirement of a good carrier gas: to be an inert gas. However, the selection criteria go further, especially in recent years, where the low availability, due to the decrease in its production, has increased the cost of He. These factors together have motivated many researchers to prefer hydrogen instead helium as carrier gas for use in gas chromatographs. However, each of these gases presents unique characteristics and implications of this change must be understood and weighed at the time of choice. A series of questions arises when one consider the possibility of exchange nitrogen or helium, by hydrogen. The issues involving efficiency, safety, operability and cost are discussed here.
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