Could one compound has different retention time at a single GC-MS analyse in the same solvant??

01 January 1970 0 371 Report

In a GCMS analyses, with an Hexan solvant.. Oleic acid (identified with NIST) came out at 4 different retention time in the same analyse.. is it possible? can I add them all together in one retention time? and how can I choose the right time?

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