Used as an internal standard in analytical chemistry for the quantification of 2,4-dichlorophenol in environmental samples. Helps in trace analysis by gas chromatography-mass spectrometry (GC-MS) due to its deuterated form, which provides a distinct mass signature. Applied in studies monitoring water quality and detecting pollutants in industrial effluents. Also utilized in research to understand the degradation pathways and environmental fate of chlorinated phenols.