Used as a calibration standard in environmental testing laboratories to ensure accurate detection and quantification of simazine residues in water, soil, and agricultural samples. Commonly applied in high-performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) analyses. Helps maintain compliance with regulatory limits for pesticide levels in drinking water and food crops. Also used in research studies assessing herbicide persistence and degradation in ecosystems.