Used as a reference standard in analytical laboratories for the accurate quantification and identification of 1,2-propanediol in various samples. Commonly applied in quality control and research settings involving pharmaceuticals, cosmetics, and food products where precise measurement of propylene glycol content is required. Ensures calibration of instruments such as gas chromatographs and HPLC systems for reliable results. Also utilized in environmental testing to detect and measure trace levels of glycols in water and air samples.