Used primarily as a reference standard in analytical chemistry for the detection and quantification of 1,1-dichloroethylene in environmental samples such as water, soil, and air. Commonly employed in gas chromatography and mass spectrometry to calibrate instruments and ensure accurate measurement of volatile organic compounds. Essential in environmental monitoring and industrial hygiene to assess contamination levels and ensure compliance with safety regulations. Also used in research settings to study degradation pathways and exposure risks associated with chlorinated hydrocarbons.