THE DETERMINATION OF FLUORINE IN RARE EARTH FLUORIDES BY HIGH TEMPERATURE HYDROLYSIS
The technique of pyrohydrolysis has been applied to the determination of fluorine in the fluorides of scandium, yttrium, and the lanthanons. These fluorides have been divided into two classes according to their rate of hydrolysls. Lutetium, ytterbium, cerium (III), scandium. gadolinium, terbium, dysprosium, holmium, erbium, and thulium auorides can be hydrolyzed in 30 min or less. Yttrium. lanthanum, praseodymium. neodymlum, samarium, and europium fluorides require from 45 to 150 min for complete hydrolysis. Accelerators, such as uranium oxide (U/sub 3/C/sub 8/), chromium(UI) oxide. and a mixture of these oxides have been used successfully to reduce the time required for quantitative hydrolysis of the fluorides in the latter group. The use of the correct accelerator reduces the hydrolysis time to 30 min or less for all these fluorides except lanthanum, praseodymium, and neodymium. (auth)
- Research Organization:
- Iowa State Coll., Ames
- NSA Number:
- NSA-12-016255
- OSTI ID:
- 4310873
- Journal Information:
- Analytica Chimica Acta (Netherlands), Vol. Vol: 19; Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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