Used primarily as a reference standard in environmental testing laboratories to detect and quantify pesticide residues, especially breakdown products of DDT, in soil, water, and biological samples. Commonly employed in gas chromatography and mass spectrometry (GC-MS) analyses to monitor environmental contamination and assess ecological and human health risks. Also utilized in research studies focusing on persistent organic pollutants (POPs), endocrine disruption, and bioaccumulation in food chains. Its presence in samples often indicates historical use of DDT and helps track long-term pollutant persistence.