Why peak purity is not determined in GC analysis?

Peak purity is not typically determined in gas chromatography (GC) analysis because the technique primarily measures the presence of volatile compounds based on their retention times and peak areas rather than their spectral characteristics. GC does not provide detailed structural information about the compounds, as it lacks the inherent capability of techniques like HPLC with diode-array detection or mass spectrometry. Therefore, while GC can confirm the separation of components, it does not assess the purity of a peak based on spectral data.