C. V. Banks, K. E. Burke, J. W. O'Laughlin
1958
Citations
0
Influential Citations
33
Citations
Journal
Analytica Chimica Acta
Abstract
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)