title: The ultrapurification of indium-111 for radiotracer studies.
abstract: We have developed a procedure for the ultrapurification of 111In. A dried sample of 111InCl3 is dissolved in 1 ml of a freshly prepared KI solution of 4% in 4 N H2SO4. After 3 ml of anhydrous diethylether has been mixed well with the aqueous and centrifuged for 5 minutes at 2000 X g, the iodide salt of 111In is recovered with the organic solvent layer at approximately 92% of the original radioactivity. The organic phase is evaporated under a gentle stream of inert gas. After the sublimation of iodine, 111In is dissolved in a solvent of choice. The extraction is highly selective for In and separates it from, at least, Fe, Al, and Zn, principle associated cationic contaminants.
mesh_terms: D003512:Cyclohexanones; D004986:Ether; D007204:Indium / Q000302:isolation & purification*; D011193:Potassium Iodide; D011868:Radioisotopes / Q000032:analysis*; D012997:Solvents; D013464:Sulfuric Acids
chemical_list: D003512:Cyclohexanones; D011868:Radioisotopes; D012997:Solvents; D013464:Sulfuric Acids; D007204:Indium; D004986:Ether; D011193:Potassium Iodide; C036468:cyclohexanone; C033158:sulfuric acid