Used as a reference standard in environmental testing laboratories to calibrate instruments for the detection and quantification of chlorophenols in water, soil, and wastewater samples. Commonly applied in gas chromatography (GC) and high-performance liquid chromatography (HPLC) analyses to ensure accurate measurement of 2,4-dichlorophenol levels, which may originate from pesticide breakdown or industrial discharges. Helps maintain compliance with regulatory guidelines by providing consistent and reliable analytical results. Also used in research settings to study degradation pathways of phenolic pollutants and to validate extraction and cleanup methods in complex matrices.