title: Rapid separation and determination by differential pulse polarography of traces of lead, cadmium, copper and zinc in pure ferric oxide preparations used as dyes in pharmaceuticals.
mesh_terms: D002104:Cadmium / Q000032:analysis; D004396:Coloring Agents / Q000032:analysis*; D003300:Copper / Q000032:analysis; D004340:Drug Contamination / Q000517:prevention & control; D005290:Ferric Compounds / Q000032:analysis*; D007501:Iron / Q000032:analysis*; D007854:Lead / Q000032:analysis; D008670:Metals / Q000032:analysis*; D008722:Methods; D011048:Polarography; D015032:Zinc / Q000032:analysis
chemical_list: D004396:Coloring Agents; D005290:Ferric Compounds; D008670:Metals; D002104:Cadmium; D007854:Lead; D003300:Copper; D007501:Iron; D015032:Zinc