PCB/toxaphene group separation on silica prior to congener specific determination of toxaphene residues in fish and other samples by GC/ECD

bacalao baltic sea cabillaud camphechlor canfecloro chromatographie en phase gazeuse cod efectos secundarios effet secondaire gas chromatography iceland insecticidas insecticide insecticides islande islandia mar baltico mer baltique nontarget effects residues residuos side effects