title: The complexation of "crowned" 4-(2,4-dinitrophenylazo)phenol with alkali and alkaline earth metal ions, and its application to the determination of Li(I) in a pharmaceutical preparation.
mesh_terms: D001391:Azo Compounds; D055598:Chemical Phenomena; D002621:Chemistry; D004987:Ethers; D008094:Lithium / Q000032:analysis*; D008672:Metals, Alkali / Q000032:analysis
chemical_list: D001391:Azo Compounds; D004987:Ethers; D008672:Metals, Alkali; C048664:4-(2,4-dinitrophenylazo)phenol; D008094:Lithium