Used as a reference standard in environmental testing laboratories to calibrate instruments and validate analytical methods for detecting chlorinated phenols in water, soil, and wastewater samples. Commonly employed in gas chromatography (GC) and high-performance liquid chromatography (HPLC) to quantify trace levels of 2,4-dichlorophenol, a degradation product of certain pesticides and a byproduct of industrial processes. Helps ensure accurate measurement of pollutant levels for regulatory compliance and environmental monitoring. Also used in research studies assessing the presence and impact of halogenated organic compounds in ecosystems.