title: Clean-up techniques for the determination of parts per trillion residue levels of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD).
mesh_terms: D002849:Chromatography, Gas; D004147:Dioxins / Q000032:analysis*; D013058:Mass Spectrometry; D008832:Microchemistry; D010573:Pesticide Residues / Q000032:analysis; D000072317:Polychlorinated Dibenzodioxins / Q000032:analysis*
chemical_list: D004147:Dioxins; D010573:Pesticide Residues; D000072317:Polychlorinated Dibenzodioxins