Used as a reference standard in analytical laboratories for the calibration of instruments such as gas chromatographs (GC) and mass spectrometers (MS). Ensures accurate detection and quantification of 1,2-dichloroethane in environmental samples, including air, water, and soil. Commonly applied in monitoring industrial emissions and contaminated sites. Also used in quality control during the production of chlorinated compounds to verify process purity and detect trace impurities.