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Spectrophotometric DeterminationRelative Standard DeviationLimit of DetectionQuantitative DeterminationSpectrophotometric MethodPerformance Liquid ChromatographyMicellar Thin-layer ChromatographyCetylpyridinium ChlorideSolid-phase ExtractionPharmaceutical AnalysisPolychlorinated BiphenylsHigh Performance Liquid ChromatographySample PreparationTotal ContentOrganochlorine PesticidesMetrological CharacteristicsPharmaceutical PreparationsElectrochemical DeterminationPolycyclic Aromatic HydrocarbonsPartial Least Squares Regression