EXPLANATION
This test method provides information on C2 through C5 carbon paraffins and mono-olefins in gasolines. It does not determine cyclic olefins, diolefins, or acetylenes. These are usually minor components in finished gasolines. The samples should not contain significant amounts of material boiling lower than ethylene.
TEST SUMMARY
The sample is injected into a gas-liquid partition column. The components are separated as they pass through the column with an inert carrier gas and their presence in the effluent is detected and recorded on a chromatograph. Sample composition is determined from the chromatogram by comparing peak areas with those obtained using known amounts of calibration standards or a synthetic blend.
TEST PRECISION
Following precision applies for total C5 and lighter olefins, and total C5 and lighter hydrocarbons:
This table is Table 1 in Test Method ASTM D2427.
The bias of this test method is not known.