Used as a reference standard in analytical laboratories for the calibration of instruments such as HPLC and GC-MS to detect and quantify 1-naphthylamine in environmental samples, industrial products, and biological matrices. Commonly applied in monitoring contamination in wastewater, air samples, and soil due to its presence as a byproduct of dye, rubber, and pesticide manufacturing. Also used in research settings to study aromatic amine exposure and potential carcinogenic effects. Ensures accuracy and reliability in quality control and regulatory compliance testing.