Used primarily as a reference standard in environmental testing laboratories to calibrate analytical instruments for the detection and quantification of DDD residues in soil, water, and biological samples. It ensures accurate measurement of pesticide breakdown products, particularly in monitoring programs assessing contamination from organochlorine pesticides. Commonly employed in gas chromatography (GC) and liquid chromatography-mass spectrometry (LC-MS) workflows to validate method performance, maintain regulatory compliance, and support quality control in environmental and agricultural testing.