A new chromatographic column is installed. The system pressure increases and retention times change., You repeat a GC analysis that worked perfectly yesterday. Today, one important peak is missing., While preparing samples, you realize one vial may have been contaminated, but the chromatogram still looks “acceptable”., Your manager asks you to speed up the analysis to meet a deadline, but faster conditions may reduce accuracy., An external auditor asks you to explain your method and show documentation for a recent analysis., A new analyst joins the lab and asks you to show them how to prepare samples correctly., Today you are responsible for running an HPLC analysis to check the purity of a new batch of medication before it is released..

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