scope:

This method covers the determination of the chemical composition of natural gas and similar gaseous mixtures within the ranges listed in Table I. In cases where peaks are known to contain one or more components, groupings are shown in Table I and also again in Figure 4. Improved results for Btu content over those obtained using GPA 2261 will not necessarily be achieved. This method is intended for use with rich gas systems and in situations where the heptanes plus compositional breakdown is desired.

Components sometimes associated with natural gases, ie., helium, carbon monoxide and hydrogen are excluded from the main body of the method. These components are determined and made a part of the complete compositional data by following special techniques outlined in Appendix B.

NOTE 1-Hydrogen suljïde is eluted in a well defined peak between ethane and propane on the suggested partition column described in 3.1.4. For further discussion of the hydrogen sulfide content in natural gases see Appendix B.