Title: A manganese-dioxide procedure for isolation and concentration of protactinium from irradiated thorium compounds
Abstract: Abstract Traces of protactinium may be coprecipitated on manganese dioxide with good recovery from solutions 1N to 4N in nitric acid upon precipitating 1·5 g of dioxide per litre by the addition of potassium permanganate to manganous nitrate in excess. Good separation is obtained from macro concentrations of thorium nitrate. In concentrations up to 0·65M the thorium does not interfere with the precipitation, while at twice this concentration definite interference is found owing to the effect on the physical properties of the solution. With the aid of hydroxylamine to redissolve the dioxide, it is possible to concentrate the protactinium with respect to carrier by a factor of 100 per cycle. Hydrogen peroxide, sodium nitrite, and formic acid were less satisfactory reagents. Simultaneous purification from thorium and uranium may be achieved. Thorium is found to carry well in trace concentrations, but the efficiency of this process falls off with increasing thorium concentration.
Publication Year: 1956
Publication Date: 1956-10-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 14
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