Decanal 2,4-dinitrophenylhydrazone is used as an analytical standard and reference compound in chemistry for the detection and quantification of aldehydes and ketones, particularly in gas chromatography and mass spectrometry. It serves as a derivatized form of decanal that reacts with 2,4-dinitrophenylhydrazine to form stable hydrazone derivatives, allowing for comparison of retention times, mass spectra, and enhanced detection sensitivity for carbonyl compounds. Commonly applied in environmental and biological sample analysis to identify trace carbonyl contaminants. Also utilized in quality control for the food and fragrance industries to monitor aldehyde content through reliable chromatographic and spectroscopic responses.