scope:

This method is intended for the analysis of hydrocarbon liquids containing nitrogen/air and carbon dioxide that fall within the compositional ranges listed in Table 1. The round-robin data includes a sample containing 62 mole percent of hexanes plus with a molar mass of 93. Therefore, for samples containing a hexanes plus with a molar mass over 93, GPA 2103 should be the test method. Refer to Section 5 for the precision statement.

Note 1 - This method can be used for a hexanes plus or heptanes plus analysis by adjusting the timing of the precut event to occur following the elution of n-pentane or n-hexane from the precut column. The term plus fraction in this document is applicable to either the hexanes plus or heptanes plus version of this analysis.

The components listed in Table 1 are determined by GC, with the exception of the plus fraction which is either ignored or precut to vent and determined volumetrically (refer to API MPMS Chapter 20.1). Physical properties for the plus fraction can either be determined by measurement or calculated from measured values." An extended analysis version of this method can be accomplished by performing GPA 2186 and mathematically combining the TCD analysis with the FID analysis. An extended analysis version must meet the performance requirements of GPA 2186 until round robin data exists for an extended analysis.