Used as a reference standard in analytical chemistry for the detection and quantification of carbonyl compounds, particularly aldehydes and ketones, in environmental and biological samples. Commonly applied in high-performance liquid chromatography (HPLC) and gas chromatography (GC) methods to identify carbonyl derivatives in air pollutants, such as those from vehicle emissions or industrial exhaust. Also utilized in quality control and calibration procedures to ensure accurate measurement of aldehyde levels in complex matrices. Its stability as a 2,4-dinitrophenylhydrazone derivative allows for reliable long-term storage and consistent performance in laboratory analyses.