title: Separation of polychlorinated biphenyls from DDT and its analogs using chromic acid and silica gel.
mesh_terms: D002840:Chromates; D003634:DDT / Q000031:analogs & derivatives*; D008722:Methods; D010575:Pesticides / Q000302:isolation & purification; D011078:Polychlorinated Biphenyls / Q000302:isolation & purification*; D012822:Silicon Dioxide
chemical_list: D002840:Chromates; D010575:Pesticides; D012822:Silicon Dioxide; D003634:DDT; D011078:Polychlorinated Biphenyls