The low-pressure carbonylation of 1-olefin is one of the main routes for the production of aldehydes. This paper presents a gas chromatographic method for the analysis of the raw material of 1-hexene, the product of heptaldehyde isomers and its by-products in this carbonylation process. A cross-linked SE-54 SCOT glass capillary column, 40m×0. 25mm (i. d.), was selected to analyse the raw material and the product in this process. GC-MS technique and comparison with pure samples were applied to the identifica...