title: Some comments on extraction analysis of cations complexed with a crown ether.
abstract: A brief review is given on the use of crown ethers in solubilizing salts of alkali and alkaline earth ions in organic polar or apolar solvents. Use of crown ethers can also be made in testing e.g. lithium salts for potassium by extraction as LKpicrate, L being 18-crown-6.
mesh_terms: D002412:Cations / Q000302:isolation & purification*; D055598:Chemical Phenomena; D002621:Chemistry; D004988:Ethers, Cyclic; D010851:Picrates / Q000302:isolation & purification; D011188:Potassium / Q000302:isolation & purification
chemical_list: D002412:Cations; D004988:Ethers, Cyclic; D010851:Picrates; D011188:Potassium