title: Arsenic in opium.
mesh_terms: D001151:Arsenic / Q000302:isolation & purification* / Q000633:toxicity; D004340:Drug Contamination; D006801:Humans; D009422:Nervous System Diseases / Q000139:chemically induced; D009892:Opium / Q000032:analysis*
chemical_list: D009892:Opium; D001151:Arsenic