This study aimed to adapt and validate the QuEChERS method for extracting and purifying 19 persistent organic pollutants—11 organochlorine compounds and 8 polychlorinated biphenyls—for GC–MS (CNI mode) analysis in bird liver samples. After extraction with acetonitrile and salt phase separation, the extract was reconstituted in hexane and cleaned using sulfuric acid. Linearity was ≥0.9, and precision was below 20% (ranging from 0.63 to 19.35%) across concentrations of 1–100 ng/g. Limits of detect