New approaches to FDA analytical problems.
D013058:Mass Spectrometry; D008722:Methods; D010573:Pesticide Residues / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis; D014481:United States; D014486:United States Food and Drug Administration
D010573:Pesticide Residues; D011078:Polychlorinated Biphenyls