Used as a certified reference standard in analytical laboratories for the accurate identification and quantification of dimethyl phthalate (DMP) in environmental, food, and biological samples. Commonly applied in gas chromatography-mass spectrometry (GC-MS) and high-performance liquid chromatography (HPLC) to calibrate instruments and validate test methods. Ensures reliable detection of phthalate contamination, especially in water, soil, and consumer products, supporting quality control and regulatory compliance in environmental and public health monitoring.