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 is important for monitoring industrial effluents and assessing contamination from pesticide degradation. Also used in research settings to study the behavior and breakdown of chlorinated organic compounds in ecosystems.