Used as a reference standard in environmental testing to calibrate analytical instruments for detecting 2,4-dichlorophenol in water, soil, and wastewater samples. Commonly applied in gas chromatography (GC) and high-performance liquid chromatography (HPLC) to ensure accurate quantification of chlorophenol contaminants. Helps monitor industrial discharges and assess compliance with environmental regulations. Also used in research studies focused on pollutant degradation and toxicity evaluation.